Eyeglass lens measuring device and storage medium

Abstract

A spectacle lens measuring device for measuring a spectacle lens includes: a light source for irradiating a measuring beam toward the spectacle lens; a transmissive display for transmitting the measuring beam from the light source and displaying an indicator pattern formed by arranging a plurality of indicators; a display control unit for controlling the display of the indicator pattern; a detector for detecting the measuring beam that has passed through the spectacle lens and the transmissive display; an optical characteristic acquisition unit for acquiring optical characteristics of the spectacle lens based on the detection results of the detector; and a lens information acquisition unit for acquiring lens information different from the optical characteristics of the spectacle lens based on the detection results of the detector, wherein the optical characteristics are acquired by displaying the indicator pattern and the lens information is acquired by hiding at least a portion of the indicator pattern. Thus, the optical characteristics and lens information of the spectacle lens can be acquired with high accuracy using a simple configuration.

Description

Technical Field

[0001] The present disclosure relates to an eyeglass lens measuring device for measuring optical characteristics of an eyeglass lens and a storage medium storing an eyeglass lens measuring program. Background Art

[0002] As a spectacle lens measuring device, there is known a device including an optical system for measuring the optical characteristics of a spectacle lens and an optical system for detecting lens information (invisible marking) of the spectacle lens (for example, see Patent Document 1).

[0003] Also known as a spectacle lens measuring device is a lens tester (e.g., see Patent Document 2) that projects a measuring beam onto a spectacle lens and detects the measuring beam after passing through the spectacle lens and an indicator plate using a detector. The measuring beam passes through the indicator plate, projecting an image of an indicator pattern formed by a plurality of indicators onto the spectacle lens.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-54454

[0007] Patent Document 2: Japanese Patent Application Laid-Open No. 2012-93348 Summary of the Invention

[0008] As a first issue, Patent Document 1 presents the following problem: Separate optical systems for obtaining the optical properties of the spectacle lens and for obtaining lens information about the spectacle lens complicate the device structure. Furthermore, the alignment of the spectacle lens with each optical system is laborious, making it difficult to easily obtain the optical properties and lens information of the spectacle lens.

[0009] As a second problem, Patent Document 2 discloses that, due to the varying refractive powers of spectacle lenses, it may be difficult to properly detect the image of an index pattern projected onto the spectacle lens. For example, multiple index images may overlap or spread, making it difficult to detect the index pattern image. In such situations, it is impossible to accurately determine the optical properties of the spectacle lens.

[0010] In view of the above-mentioned conventional technologies, the present disclosure sets as a technical object the provision of an eyeglass lens measuring device capable of acquiring optical characteristics and lens information of an eyeglass lens with high precision using a simple configuration.

[0011] A first embodiment of the present disclosure is a spectacle lens measuring device for measuring a spectacle lens, characterized by comprising: a light source for irradiating a measuring beam toward the spectacle lens; a transmissive display for transmitting the measuring beam from the light source and capable of displaying an indicator pattern formed by arranging a plurality of indicators; a display control unit for controlling the display of the indicator pattern; a detector for detecting the measuring beam that has passed through the spectacle lens and the transmissive display; an optical characteristic acquisition unit for acquiring the optical characteristics of the spectacle lens based on a detection result of the detector; and a lens information acquisition unit for acquiring lens information of the spectacle lens that is different from the optical characteristics based on the detection result of the detector, wherein the optical characteristic acquisition unit acquires the optical characteristics by displaying the indicator pattern using the display control unit, and the lens information acquisition unit acquires the lens information by non-displaying at least a portion of the indicator pattern by the display control unit.

[0012] A second embodiment of the present disclosure is a spectacle lens measuring device for measuring the optical properties of a spectacle lens, and is characterized by comprising: a transmissive display that transmits a measuring beam from a light source and is capable of displaying an indicator pattern formed by arranging a plurality of indicators; a display control unit that controls the display of the indicator pattern; and an interval setting unit that is capable of setting the intervals between the plurality of indicators. The spectacle lens measuring device obtains the optical properties of the spectacle lens based on the measuring beam that has passed through the spectacle lens and the transmissive display.

[0013] A storage medium according to a third aspect of the present disclosure stores a spectacle lens measurement program for use in a spectacle lens measurement device including a transmissive display that transmits a measurement beam from a light source and is capable of displaying an indicator pattern formed by arranging a plurality of indicators, for measuring optical properties of a spectacle lens. The storage medium is characterized in that the spectacle lens measurement program, when executed by a processor of the spectacle lens measurement device, causes the spectacle lens measurement device to execute: a display control step of displaying the indicator pattern on the transmissive display; and an interval setting step of setting the intervals between the plurality of indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an external view of the measuring device.

[0015] Figure 2 This is a schematic diagram of the eyeglass support unit and lens measuring unit.

[0016] Figure 3A This is an example of an indicator pattern in which the intervals between a plurality of indicators are set to a predetermined distance.

[0017] Figure 3BThis is an example of an indicator pattern in which the intervals between a plurality of indicators are set to a distance shorter than a predetermined distance.

[0018] Figure 3C This is an example of an indicator pattern in which the intervals between a plurality of indicators are set to a distance longer than a predetermined distance.

[0019] Figure 4A This is an example of a captured image obtained by displaying the first indicator pattern in a state where the glasses are not placed on the glasses support unit.

[0020] Figure 4B This is an example of a captured image obtained by displaying the first indicator pattern in a state where the glasses are placed on the glasses support unit.

[0021] Figure 5A This is an example of a captured image obtained by displaying the second indicator pattern in a state where the glasses are not placed on the glasses support unit.

[0022] Figure 5B This is an example of a captured image obtained by displaying the second indicator pattern in a state where the glasses are placed on the glasses support unit.

[0023] Figure 6 This is a diagram showing a control system of the measuring device.

[0024] Figure 7 is a schematic diagram showing a measuring light beam from a light source.

[0025] Figure 8 It is a diagram showing the meridian direction of the lens.

[0026] Figure 9 This is an example of a measurement image.

[0027] Figure 10 This is an example of a measurement optical system equipped with a single transmissive display.

[0028] Figure 11 This is an example of a configuration in which the optical path of the measuring light beam guided to the left lens and the optical path of the measuring light beam guided to the right lens are different optical paths.

[0029] Figure 12 This is an example of a structure that uses a display as a light source.

[0030] Figure 13A This is a measurement image obtained when the position of the irradiation pattern displayed on the display is moved.

[0031] Figure 13B It is a processed image obtained by processing a plurality of captured images. DETAILED DESCRIPTION

[0032] <Summary>

[0033] The outline of the spectacle lens measuring device according to the embodiment of the present disclosure will be described. Note that the items categorized by the following "use" can be used independently or in conjunction with each other.

[0034] <Measurement Optical System>

[0035] The spectacle lens measuring device in this embodiment includes a measuring optical system (e.g., the measuring optical system 20). The measuring optical system includes a structure for measuring the optical properties of the spectacle lens. For example, the optical properties of the spectacle lens may be at least any one of spherical power, cylindrical power, astigmatism axis angle, prism amount, etc. In addition, the measuring optical system includes a structure for obtaining lens information of the spectacle lens. For example, the lens information of the spectacle lens is information different from the optical properties. For example, the lens information of the spectacle lens may be information different from the optical properties measured by the measuring optical system. As an example, the lens information of the spectacle lens may be at least any one of information related to an invisible mark formed on the spectacle lens, information related to a mark point marked on the spectacle lens, information related to a printed mark marked on the spectacle lens, information related to the outer shape of the spectacle lens, etc. For example, the measuring optical system may use at least a part of the structure for measuring the optical properties of the spectacle lens and the structure for obtaining lens information of the spectacle lens.

[0036] The measuring optical system only needs to include a light source, a transmissive display, and a detector. For example, the following structure can be used: a measuring beam is projected from the light source toward the eyeglass lens, and the measuring beam that has passed through the eyeglass lens and the transmissive display is detected by the detector, thereby measuring the optical properties of the eyeglass lens. It should be noted that the measuring optical system can include a retroreflective component that can reflect the measuring beam from the light source in the direction of incidence and return it to illuminate the eyeglass lens. In addition, the measuring optical system can include an optical component (for example, a collimating lens 23) for shaping the measuring beam from the light source. In addition, the measuring optical system can include an optical path branching component (for example, a half-mirror 22) for branching the measuring beam from the light source into multiple optical paths.

[0037] <Light Source>

[0038] The spectacle lens measurement device in this embodiment includes a light source (e.g., light source 21). The light source irradiates a measurement beam toward the spectacle lens. The light source can be positioned at any location. The light source can be a point light source. In this case, for example, an LED (Light Emitting Diode) can be used. Alternatively, the light source can be a surface light source. In this case, for example, a light-emitting panel can be used.

[0039] It should be noted that the light source can be a display capable of illuminating the spectacle lens by irradiating a measurement beam toward the spectacle lens. In this case, for example, at least one of a liquid crystal display, an organic EL display, a plasma display, and the like can be used as the light source. The display can project an illumination pattern onto the spectacle lens by displaying an illumination pattern different from the indicator pattern formed by arranging multiple indicators described later. In addition, by illuminating the spectacle lens, the display can produce a high-contrast image of the spectacle lens, an image of the indicator pattern projected onto the spectacle lens (indicator image), and an image of the illumination pattern projected onto the spectacle lens, thereby improving the detection accuracy of these images.

[0040] The light source may include a first light source and a second light source. For example, the first light source may be a left-lens light source that irradiates a measuring beam toward the left lens of the glasses. Alternatively, for example, the second light source may be a right-lens light source that irradiates a measuring beam toward the right lens of the glasses.

[0041] The first light source and the second light source can be used in combination. That is, the first light source (the second light source) can irradiate the measuring beam toward the left lens and the right lens of the glasses. For example, the first light source (the second light source) can irradiate the measuring beam toward the left lens and the right lens in sequence. In this case, a changing unit (for example, a motor, etc.) can be provided to change the relative positional relationship between the first light source (the second light source) and the glasses lens. In addition, for example, the first light source (the second light source) can irradiate the measuring beam toward both the left lens and the right lens. As an example, the measuring beam can be irradiated toward both the left lens and the right lens by arranging both the left lens and the right lens in an optical path that receives the irradiation of the measuring beam from the first light source (the second light source). In this way, optical characteristics can be obtained simultaneously at the left lens and the right lens. In addition, in this way, lens information can be obtained simultaneously at the left lens and the right lens.

[0042] The first and second light sources may be provided as a left-right pair. Specifically, the first light source may illuminate the measuring beam toward the left lens of the glasses, while the second light source may illuminate the measuring beam toward the right lens of the glasses. In this case, at least a portion of the first optical path guiding the measuring beam from the first light source toward the left lens and the second optical path guiding the measuring beam from the second light source toward the right lens may be a common optical path. Alternatively, in this case, the first optical path guiding the measuring beam from the first light source toward the left lens and the second optical path guiding the measuring beam from the second light source toward the right lens may be separate optical paths.

[0043] For example, the first and second light sources may be activated at different timings, irradiating the left and right lenses with the measuring beam sequentially. Alternatively, the first and second light sources may be activated at the same (approximately the same) timing, irradiating both the left and right lenses with the measuring beam. In other words, the left and right lenses may be irradiated with the measuring beam simultaneously (approximately simultaneously).

[0044] <Transmissive Display>

[0045] The spectacle lens measurement device in this embodiment includes a transmissive display (e.g., transmissive display 24). The transmissive display transmits the measurement beam from the light source. Furthermore, the transmissive display can display an indicator pattern (e.g., indicator pattern 30) formed by arranging a plurality of indicators (e.g., indicator 31).

[0046] In a transmissive display, an indicator pattern formed by arranging multiple indicators is used to measure the optical properties of eyeglass lenses. The multiple indicators are formed in any shape, position, or number, thereby representing an indicator pattern. For example, the multiple indicators can have at least one of the following shapes: dots (e.g., circular dots, quadrilateral dots, etc.) or lines (e.g., solid lines, dotted lines, dashed lines, etc.). Furthermore, for example, the multiple indicators can be arranged in at least one of a grid pattern, a radial pattern, and concentric circles.

[0047] It should be noted that, when measuring the optical properties of eyeglass lenses, an indicator pattern can be used to obtain positional information indicating the location at which a measuring beam from a light source passes through a transmissive display. Therefore, it is preferable that the plurality of indicators be displayed in a manner that allows for ascertaining positional information regarding the location at which the measuring beam from a light source passes through the transmissive display.

[0048] The transmissive display may include a first transmissive display and a second transmissive display. For example, the first transmissive display may be a transmissive display for the left lens, projecting an indicator pattern image onto the left lens of the glasses. Alternatively, for example, the second transmissive display may be a transmissive display for the right lens, projecting an indicator pattern image onto the right lens of the glasses.

[0049] The first and second transmissive displays can be used concurrently. Specifically, the first (second) transmissive display can project an indicator pattern onto both the left and right lenses of the glasses. For example, the first (second) transmissive display can display an indicator pattern and project the indicator pattern onto both the left and right lenses. This allows the indicator pattern to be projected onto both the left and right lenses simultaneously.

[0050] Alternatively, for example, the first transmissive display (second transmissive display) may project an indicator pattern image onto the left lens and the right lens in sequence. In this case, the first transmissive display (second transmissive display) may include a first region for projecting the indicator pattern image onto the left lens and a second region for projecting the indicator pattern image onto the right lens. The first transmissive display (second transmissive display) may project the indicator pattern image onto the left lens and the right lens in sequence by displaying the indicator pattern at different timings in each region.

[0051] The first and second transmissive displays can be arranged as a left and right pair. That is, the first transmissive display can project an indicator pattern image onto the left lens of the glasses, and the second transmissive display can project an indicator pattern image onto the right lens of the glasses. For example, the first and second transmissive displays can project the indicator pattern image onto both the left and right lenses by displaying the indicator pattern at the same (approximately the same) timing. That is, the indicator pattern image can be projected onto the left and right lenses simultaneously (approximately simultaneously). Alternatively, for example, the first and second transmissive displays can project the indicator pattern image onto the left and right lenses sequentially by displaying the indicator pattern at different timings.

[0052] For example, by displaying an indicator pattern on a transmissive display, positional information indicating the passage positions of a measuring beam from a light source through at least two points in the optical axis direction is obtained, and the optical properties of the eyeglass lenses are measured based on this information. As an example, the optical properties of the eyeglass lenses can be measured using positional information indicating the passage positions of the measuring beam from the light source through the eyeglass lenses and positional information indicating the passage positions of the measuring beam from the light source through the transmissive display. More specifically, the optical properties of the left eyeglass lens can be measured using positional information indicating the passage positions of the measuring beam from the light source through the left eyeglass lens and positional information indicating the passage positions of the measuring beam from the light source through the first transmissive display. Furthermore, the optical properties of the right eyeglass lens can be measured using positional information indicating the passage positions of the measuring beam from the light source through the right eyeglass lens and positional information indicating the passage positions of the measuring beam from the light source through the second transmissive display.

[0053] In addition, as an example, the optical characteristics of the eyeglass lenses can be measured using only the position information indicating the passing position of the measuring light beam from the light source through the transmissive display. More specifically, the optical characteristics of the left lens can be measured using only the position information indicating the passing position of the measuring light beam from the light source through the first transmissive display. In addition, the optical characteristics of the right lens can be measured using only the position information indicating the passing position of the measuring light beam from the light source through the second transmissive display. It should be noted that in such a case, a changing unit (for example, a moving mechanism 28) can be provided to change the relative positional relationship between the first transmissive display and the left lens. In addition, in such a case, a changing unit (for example, a moving mechanism 28) can be provided to change the relative positional relationship between the second transmissive display and the right lens.

[0054] The first transmissive display may include a transmissive display capable of displaying a first indicator pattern and a transmissive display capable of displaying a second indicator pattern. Specifically, the transmissive display capable of displaying the first indicator pattern may project the first indicator pattern onto the left lens of the glasses, while the transmissive display capable of displaying the second indicator pattern may project the second indicator pattern onto the left lens of the glasses. The transmissive display capable of displaying the first indicator pattern and the transmissive display capable of displaying the second indicator pattern may be positioned at different locations along the optical axis. It should be noted that the first indicator pattern and the second indicator pattern may be the same indicator pattern. Of course, the first indicator pattern and the second indicator pattern may be at least partially different indicator patterns.

[0055] Furthermore, the second transmissive display may include a transmissive display capable of displaying a first indicator pattern and a transmissive display capable of displaying a second indicator pattern. Specifically, the transmissive display capable of displaying the first indicator pattern may project the first indicator pattern onto the right lens of the glasses, while the transmissive display capable of displaying the second indicator pattern may project the second indicator pattern onto the right lens of the glasses. The transmissive display capable of displaying the first indicator pattern and the transmissive display capable of displaying the second indicator pattern may be positioned at different locations along the optical axis. It should be noted that the first indicator pattern and the second indicator pattern may be the same indicator pattern. Of course, the first indicator pattern and the second indicator pattern may be at least partially different indicator patterns.

[0056] For example, by displaying an indicator pattern on a transmissive display capable of displaying a first indicator pattern and a transmissive display capable of displaying a second indicator pattern, positional information indicating the passage of a measuring beam from a light source through at least two points along the optical axis is obtained. Based on this information, the refractive angle of the measuring beam is determined to measure the optical properties of the eyeglass lens. More specifically, the optical properties of the left lens of the eyeglass lens can be measured using the positional information indicating the passage of the measuring beam from the light source through the transmissive display capable of displaying the first indicator pattern and the positional information indicating the passage of the measuring beam from the light source through the transmissive display capable of displaying the second indicator pattern on the first transmissive display. Furthermore, the optical properties of the right lens of the eyeglass lens can be measured using the positional information indicating the passage of the measuring beam from the light source through the transmissive display capable of displaying the first indicator pattern and the positional information indicating the passage of the measuring beam from the light source through the transmissive display capable of displaying the second indicator pattern on the second transmissive display.

[0057] For example, by placing a transmissive display capable of displaying a first indicator pattern and a transmissive display capable of displaying a second indicator pattern at different positions along the optical axis, it is possible to obtain positional information regarding the locations where the measuring beam from the light source passes through at least two points along the optical axis, regardless of the location at which the measuring beam from the light source passes through the spectacle lens. This allows the optical characteristics of the spectacle lens to be measured. This allows the optical characteristics of the spectacle lens to be accurately acquired with a simple configuration, without requiring a means for changing the relative positional relationship between the spectacle lens and the transmissive display.

[0058] <Detector>

[0059] The spectacle lens measurement device in this embodiment includes a detector (e.g., an imaging element 27). The detector detects the measuring beam that has passed through the spectacle lens and the transmissive display. For example, the detector can detect the measuring beam that has passed through the spectacle lens and the first transmissive display, and the measuring beam that has passed through the spectacle lens and the second transmissive display. Alternatively, for example, the detector can detect the measuring beam that has been reflected by a retroreflective member (described later) after being emitted from a light source. Furthermore, for example, the detector can detect the measuring beam from a display serving as a light source.

[0060] The detector can be arranged at any position on the eyeglass lens. The detector can detect the measuring beam based on the signal (signal data). Alternatively, the detector can detect the measuring beam based on an image (image data) obtained by converting the signal (signal data).

[0061] The detector may include a first detector and a second detector. For example, the first detector may be a left-lens detector that detects the measuring beam passing through the left lens of the glasses and the transmissive display. Alternatively, for example, the second detector may be a right-lens detector that detects the measuring beam passing through the right lens of the glasses and the transmissive display.

[0062] The first detector and the second detector can be used in combination. That is, the first detector (the second detector) can detect the measuring light beam that has passed through the left lens of the glasses and the transmissive display, and the measuring light beam that has passed through the right lens of the glasses and the transmissive display. For example, the first detector (the second detector) can detect the measuring light beam that has passed through the left lens and the transmissive display, and the measuring light beam that has passed through the right lens and the transmissive display in sequence. In this case, a changing unit (for example, a motor, etc.) that changes the relative positional relationship between the first detector (the second detector) and the glasses lenses can be provided. In addition, for example, the first detector (the second detector) can detect both the measuring light beam that has passed through the left lens and the transmissive display, and the measuring light beam that has passed through the right lens and the transmissive display. Thus, optical characteristics can be obtained at the left lens and the right lens at the same time. In addition, lens information can be obtained at the left lens and the right lens at the same time.

[0063] The first detector and the second detector may be provided as a left-right pair. That is, the first detector may detect the measuring beam passing through the left lens of the glasses and the transmissive display, while the second detector may detect the measuring beam passing through the right lens of the glasses and the transmissive display. For example, the first detector and the second detector may sequentially detect the measuring beam passing through the left lens and the transmissive display, and the measuring beam passing through the right lens and the transmissive display. Alternatively, for example, the first detector and the second detector may detect both the measuring beam passing through the left lens and the transmissive display, and the measuring beam passing through the right lens and the transmissive display. In other words, the measuring beam passing through the left lens and the transmissive display and the measuring beam passing through the right lens and the transmissive display may be detected simultaneously.

[0064] It should be noted that when the first and second detectors are arranged as a left-right pair, the number of detector pixels can be effectively utilized for each of the left and right lenses of the eyeglasses, allowing for more accurate detection of the position of the index pattern image (index image), thereby improving the accuracy of optical property measurement. Furthermore, since there is no need to distinguish between the measurement beam passing through the left lens and the transmissive display and the measurement beam passing through the right lens and the transmissive display, optical properties and lens information of the eyeglass lenses can be acquired with simpler control.

[0065] <Retroreflective Member>

[0066] The spectacle lens measuring device in this embodiment includes a retroreflective member (e.g., retroreflective member 25). The retroreflective member reflects the measuring light beam, which is directed from the light source toward the spectacle lens and passes through the spectacle lens and the transmissive display, back in the direction of incidence, thereby illuminating the spectacle lens with the reflected beam of the measuring light beam. Specifically, the retroreflective member can align the incident direction of the measuring light beam from the light source and the reflected direction of the measuring light beam from the light source with parallel (approximately parallel) directions, thereby illuminating the spectacle lens with the reflected beam of the measuring light beam. In other words, the retroreflective member can reflect the measuring light beam from the light source to illuminate the spectacle lens. This allows the spectacle lens image and the index pattern image (index image) projected onto the spectacle lens to be obtained with high contrast, thereby improving the detection accuracy of these images.

[0067] For example, the retroreflective member can reflect the measuring beam from the light source and illuminate the reflected measuring beam toward the front surface of the spectacle lens. As an example, in a configuration in which the light source and the detector are arranged on the rear surface side of the spectacle lens, the retroreflective member can be arranged on the front surface side of the spectacle lens, thereby reflecting the measuring beam from the light source and illuminating the reflected measuring beam toward the front surface of the spectacle lens. Alternatively, for example, the retroreflective member can reflect the measuring beam from the light source and illuminating the reflected measuring beam toward the rear surface of the spectacle lens. As an example, in a configuration in which the light source and the detector are arranged on the front surface side of the spectacle lens, the retroreflective member can be arranged on the rear surface side of the spectacle lens, thereby reflecting the measuring beam from the light source and illuminating the reflected measuring beam toward the rear surface of the spectacle lens.

[0068] The retroreflective member may include a first retroreflective member and a second retroreflective member. For example, the first retroreflective member may be a left-lens retroreflective member that reflects a measuring light beam directed from a light source toward the left lens of the glasses, passes through the left lens and the transmissive display, and returns the measuring light beam to the left lens. Alternatively, for example, the second retroreflective member may be a right-lens retroreflective member that reflects a measuring light beam directed from a light source toward the right lens of the glasses, passes through the right lens and the transmissive display, and returns the measuring light beam to the right lens.

[0069] The first retroreflective member and the second retroreflective member may serve as both. That is, the first retroreflective member (the second retroreflective member) may reflect the measuring beam emitted from the light source toward the left lens of the eyeglasses in the direction of incidence and return the reflected measuring beam to the left lens, and may reflect the measuring beam emitted from the light source toward the right lens of the eyeglasses in the direction of incidence and return the reflected measuring beam to the right lens.

[0070] The first retroreflective member and the second retroreflective member may be provided as a pair on the left and right sides. Specifically, the first retroreflective member may reflect the measuring light beam emitted from the light source toward the left lens of the eyeglasses in the direction of incidence and return the reflected measuring light beam to the left lens, while the second retroreflective member may reflect the measuring light beam emitted from the light source toward the right lens of the eyeglasses in the direction of incidence and return the reflected measuring light beam to the right lens.

[0071] It should be noted that, if the spectacle lens can be sufficiently illuminated by reflecting the measurement light beam from the light source, provision of a retroreflective member is not necessarily required. Furthermore, if a configuration is adopted in which one of the light source and the detector is disposed on the front surface side of the spectacle lens and the other is disposed on the rear surface side of the spectacle lens, provision of a retroreflective member is not necessarily required.

[0072] <Optical Configuration of Measurement Optical System>

[0073] In this embodiment, the measuring optical system may include a light source, a detector, a transmissive display, a retroreflective member, etc. Furthermore, in this embodiment, the measuring optical system may include the light source and the detector on the front surface side of the spectacle lens, and the transmissive display and the reflective member on the back surface side of the spectacle lens.

[0074] For example, in a measurement optical system in which both a first light source and a second light source are used, and both a first detector and a second detector are used, a measurement beam emitted from the light source is directed toward both the left and right lenses of the eyeglasses. The detector detects the measurement beam, which passes through the left lens and the transmissive display, is reflected by the retroreflective member, and then again passes through the transmissive display and the left lens. The detector also detects the measurement beam, which passes through the right lens and the transmissive display, is reflected by the retroreflective member, and then again passes through the transmissive display and the right lens.

[0075] For example, in a measuring optical system, where a first light source and a second light source are provided as a left-right pair, and a first detector and a second detector are provided as a left-right pair, the measuring light beam emitted from the first light source passes through the left lens of the eyeglasses and the transmissive display, is reflected by the retroreflective member, passes through the transmissive display and the left lens again, and is detected by the first detector. Furthermore, the measuring light beam emitted from the second light source passes through the right lens of the eyeglasses and the transmissive display, is reflected by the retroreflective member, passes through the transmissive display and the right lens again, and is detected by the second detector.

[0076] For example, in a measurement optical system where both a first light source and a second light source are used, and a first detector and a second detector are provided as a left-right pair, the measurement beam emitted from the light source is directed toward both the left and right lenses of the eyeglasses. The measurement beam, which passes through the left lens and the transmissive display, is reflected by the retroreflective member, then again passes through the transmissive display and the left lens, is detected by the first detector. The measurement beam, which passes through the right lens and the transmissive display, then is reflected by the retroreflective member, then again passes through the transmissive display and the right lens, is detected by the second detector.

[0077] For example, in a measuring optical system where a first light source and a second light source are provided as a left-right pair, and a first detector and a second detector are used in combination, the measuring beam emitted from the first light source is directed toward the left lens of the glasses, and the measuring beam emitted from the second light source is directed toward the right lens of the glasses. The measuring beam, which passes through the left lens and the transmissive display, is reflected by the retroreflective member, then again passes through the transmissive display and the left lens; and the measuring beam, which passes through the right lens and the transmissive display, then again passes through the retroreflective member, then again passes through the transmissive display and the right lens, are both detected by the detector.

[0078] It should be noted that, regardless of which of the above-mentioned structures is used, in the measurement optical system, the first transmissive display and the second transmissive display may be used in combination, or may be provided as a left-right pair. The first transmissive display may include a transmissive display capable of displaying a first indicator pattern and a transmissive display capable of displaying a second indicator pattern, both arranged at different positions along the optical axis. The second transmissive display may include a transmissive display capable of displaying a first indicator pattern and a transmissive display capable of displaying a second indicator pattern, both arranged at different positions along the optical axis. Furthermore, regardless of which of the above-mentioned structures is used, in the measurement optical system, the first retroreflective member and the second retroreflective member may be used in combination, or may be provided as a left-right pair.

[0079] In this embodiment, the measuring optical system may include a display as a light source, a detector, a transmissive display, etc. In this embodiment, the measuring optical system may include a detector disposed on the front surface side of the spectacle lens and a display and a transmissive display disposed on the back surface side of the spectacle lens.

[0080] For example, in a measurement optical system that uses both a first display and a second display, and also uses both a first detector and a second detector, the measurement beam emitted from the display is directed toward both the left and right lenses of the eyeglasses. The detector detects both the measurement beam that has passed through the left lens and the transmissive display, and the measurement beam that has passed through the right lens and the transmissive display.

[0081] For example, in a measurement optical system, if a first display and a second display are provided as a left-right pair, and a first detector and a second detector are provided as a left-right pair, the measurement beam emitted from the first display passes through the left lens of the glasses and the transmissive display, and is detected by the first detector. Separately, the measurement beam emitted from the second display passes through the right lens of the glasses and the transmissive display, and is detected by the second detector.

[0082] For example, in a measurement optical system where both a first display and a second display are used, and a first detector and a second detector are provided as a left-right pair, the measurement beam emitted from the display is directed toward both the left and right lenses of the eyeglasses. The measurement beam that has passed through the left lens and the transmissive display is detected by the first detector, while the measurement beam that has passed through the right lens and the transmissive display is detected by the second detector.

[0083] For example, in a measurement optical system where a first display and a second display are arranged as a left-right pair and both the first and second detectors are used, the measurement beam emitted from the first display is directed toward the left lens of the glasses, and the measurement beam emitted from the second display is directed toward the right lens of the glasses. The measurement beam that has passed through the left lens and the transmissive display, and the measurement beam that has passed through the right lens and the transmissive display, are both detected by the detector.

[0084] It should be noted that, regardless of the above configuration, in the measurement optical system, the first and second transmissive displays may be used together, or may be provided as a pair on either side. The first transmissive display may include a transmissive display capable of displaying a first indicator pattern and a transmissive display capable of displaying a second indicator pattern, both positioned at different locations along the optical axis. The second transmissive display may include a transmissive display capable of displaying a first indicator pattern and a transmissive display capable of displaying a second indicator pattern, both positioned at different locations along the optical axis.

[0085] <Indicator Pattern Image Detection Unit>

[0086] The spectacle lens measuring device in this embodiment includes an indicator pattern image detection unit (e.g., the control unit 70). The indicator pattern image detection unit detects an image of an indicator pattern projected onto the spectacle lens (indicator pattern image) based on the detection result of the detector. For example, the indicator pattern image detection unit can detect the indicator pattern image based on the signal (signal data) detected by the detector. As an example, the indicator pattern image detection unit can detect the indicator pattern image based on the intensity of the signal detected by the detector. In addition, for example, the indicator pattern image detection unit can detect the indicator pattern image based on an image (image data) obtained by transforming the signal detected by the detector. As an example, the indicator pattern image detection unit can obtain the indicator pattern image based on at least any one of luminance information, chroma information, hue information, etc. of the image.

[0087] For example, the indicator pattern image detection unit can detect the intervals between multiple indicator images constituting the indicator pattern image based on the detection results of the detector. In this case, the intervals between the multiple indicator images can be detected using pixel position information of the multiple indicator images. In addition, for example, the indicator pattern image detection unit can detect the shape of the indicator images constituting the indicator pattern image based on the detection results of the detector. In this case, the shape of the indicator image can be detected by image processing (for example, binarization, contour extraction, edge detection, etc.). In this case, the area of the indicator image can be detected based on the shape of the indicator image.

[0088] <Judgment Unit>

[0089] The spectacle lens measuring device in this embodiment includes a determination unit (e.g., the control unit 70). The determination unit determines whether the spectacle lens is a concave lens or a convex lens based on the detection result of the detector. For example, the determination unit can determine whether the spectacle lens is a concave lens or a convex lens based on the change in pixel position information of the indicator image constituting the indicator pattern image obtained as the detection result of the detector. As an example, the determination unit can determine that the spectacle lens is a concave lens when the pixel positions of the indicator images are close to each other (in other words, when the interval between the indicator images is narrowed). In addition, as an example, the determination unit can determine that the spectacle lens is a convex lens when the pixel positions of the indicator images are separated from each other (in other words, when the interval between the indicator images is widened).

[0090] It should be noted that, for example, the determination unit may determine whether the spectacle lens is a strong concave lens or a strong convex lens. In this case, the determination unit may determine whether the spectacle lens is a strong concave lens or a strong convex lens based on the degree of change in the pixel position information of the index image obtained as a detection result of the detector. For example, the degree of change in the pixel position information of the index image may be represented by at least one of a rate of change (magnification / reduction rate) of the pixel position information of the index image, an amount of change (magnification / reduction amount) of the pixel position information of the index image, and the like.

[0091] <Interval Setting Unit>

[0092] The spectacle lens measuring device in this embodiment includes an interval setting unit (e.g., the control unit 70). The interval setting unit is capable of setting the intervals between the multiple indicators that constitute the indicator pattern in the transmissive display. For example, the interval setting unit may be capable of setting the intervals between the multiple indicators that constitute the indicator pattern in the transmissive display to any interval. Alternatively, for example, the interval setting unit may be capable of setting the intervals between the multiple indicators that constitute the indicator pattern in the transmissive display to a predetermined interval. This allows for obtaining an appropriate indicator pattern image corresponding to the spectacle lens and obtaining optical characteristics with high precision. Furthermore, even when measuring a wide range of optical characteristics of the spectacle lens or obtaining a distribution of the optical characteristics of the spectacle lens, the optical characteristics can be obtained with high precision.

[0093] For example, the interval setting unit sets the intervals between the multiple indicators based on an instruction signal for setting the intervals between the multiple indicators. As an example, the interval setting unit may set the intervals between the multiple indicators based on an instruction signal input by an operator operating an operating unit (e.g., monitor 4). Alternatively, as an example, the interval setting unit may set the intervals between the multiple indicators based on an instruction signal output based on a detection result of a detector.

[0094] It should be noted that in this case, the interval setting unit can set the intervals between the multiple indicators using a table that establishes a correspondence between the detection results of the detector and the intervals between the multiple indicators displayed on the transmissive display. In other words, the interval setting unit can set the intervals between the multiple indicators to different intervals based on the detection results of the detector. For example, the table can be pre-set based on experimental or simulation results.

[0095] In addition, in this case, the interval setting unit can set the intervals of the multiple indicators based on whether the detection result detected by the detector exceeds a specified threshold. That is, the interval setting unit can set the intervals of the multiple indicators to different intervals when the detection result detected by the detector exceeds the specified threshold and when it is less than the specified threshold. It should be noted that the specified threshold can be set as an allowable range. In this case, the interval setting unit can set the intervals of the multiple indicators to different intervals when the detection result detected by the detector is outside the allowable range and when it is within the allowable range. For example, the specified threshold can be pre-set based on the results of experiments, simulations, etc.

[0096] Thus, the intervals between multiple indicators are automatically switched according to the spectacle lens, making it easy to obtain an appropriate index pattern image corresponding to the spectacle lens, and to obtain the optical properties of the spectacle lens with high precision. It should be noted that such setting of the intervals between multiple indicators is particularly effective in a fully automated device that automatically performs the optical property measurement from the start to the completion after the spectacle lens is placed.

[0097] The interval setting unit can set the intervals between the multiple indicators displayed on the transmissive display based on the detection results of the indicator pattern image detection unit. As a result, the intervals between the multiple indicators are automatically set, making it easy to obtain an appropriate indicator pattern image corresponding to the eyeglass lens.

[0098] For example, the interval setting unit can set the intervals between the multiple indicators displayed on the transmissive display based on the intervals between the multiple indicator images constituting the indicator pattern detected by the indicator pattern image detection unit. In this case, the intervals between the indicators can be set by establishing a corresponding table between the intervals between the multiple indicator images constituting the indicator pattern detected by the indicator pattern image detection unit and the intervals between the multiple indicators displayed on the transmissive display. In addition, in this case, the intervals between the multiple indicators can be set based on whether the intervals between the multiple indicator images constituting the indicator pattern detected by the indicator pattern image detection unit exceed a specified threshold. It should be noted that, for example, the specified threshold can be set relative to the direction in which the intervals between the indicator images are narrowing. In addition, for example, the specified threshold can be set relative to the direction in which the intervals between the indicator images are widening. Of course, the specified threshold can be set as an allowable range in the direction in which the intervals between the indicator images are narrowing and the direction in which the intervals between the indicator images are widening.

[0099] Alternatively, for example, the interval setting unit may set the intervals between the indicators based on the shapes of the multiple indicator images constituting the indicator pattern detected by the indicator pattern image detection unit. In this case, the intervals between the multiple indicators may be set based on whether the shapes of the multiple indicator images detected by the indicator pattern image detection unit are deformed relative to the shapes of the multiple indicators displayed on the transmissive display. Alternatively, in this case, the intervals between the multiple indicators may be set based on whether the degree of deformation (e.g., deformation rate, deformation amount, etc.) of the multiple indicator images detected by the indicator pattern image detection unit exceeds a predetermined threshold. For example, the deformation of the multiple indicator images may be at least one of enlargement, reduction, skewness, and loss.

[0100] In addition, for example, the interval setting unit can set the intervals of the multiple indicators based on the areas of the multiple indicator images constituting the indicator pattern detected by the indicator pattern image detection unit. In this case, the intervals of the multiple indicators can be set based on whether the areas of the multiple indicator images detected by the indicator pattern image detection unit have increased or decreased relative to the areas of the multiple indicators displayed on the transmissive display. In addition, in this case, the intervals of the multiple indicators can be set based on whether the degree of change (for example, rate of change, amount of change, etc.) in the areas of the multiple indicator images constituting the indicator pattern detected by the indicator pattern image detection unit exceeds a prescribed threshold. It should be noted that, for example, the prescribed threshold can be set relative to the direction in which the area of the indicator image decreases. In addition, for example, the prescribed threshold can be set relative to the direction in which the area of the indicator image increases. Of course, the prescribed threshold can be set as an allowable range in the direction in which the area of the indicator image decreases and in the direction in which the area of the indicator image increases.

[0101] The interval setting unit can set the intervals of multiple indicators constituting the indicator pattern displayed on the transmissive display based on the acquisition result of the optical characteristic acquisition unit (the calculation result of the calculation unit). In this case, the intervals of the multiple indicators can be set by using a table that establishes a correspondence between the refractive power of the eyeglass lens detected by the optical characteristic acquisition unit and the intervals of the multiple indicators displayed on the transmissive display. In addition, in this case, the intervals of the multiple indicators can be set based on whether the refractive power of the eyeglass lens detected by the optical characteristic acquisition unit exceeds a specified threshold. It should be noted that, for example, the specified threshold can be set relative to the direction in which the refractive power of the eyeglass lens increases (becomes higher). In addition, for example, the specified threshold can be set relative to the direction in which the refractive power of the eyeglass lens decreases (becomes lower). Of course, the specified threshold can be set as an allowable range in the direction in which the refractive power of the eyeglass lens increases and in the direction in which the refractive power of the eyeglass lens decreases.

[0102] The interval setting unit may set the intervals between the plurality of indicators constituting the indicator pattern displayed on the transmissive display based on the determination result of the determination unit. In this case, the intervals between the plurality of indicators may be set using, for example, a table that associates the types of eyeglass lenses determined by the determination unit with the intervals between the indicators displayed on the transmissive display.

[0103] It should be noted that in this embodiment, the intervals between multiple indicators displayed on the transmissive display can be set based on at least any one of the detection results of the indicator pattern image detection unit as described above, the acquisition results of the optical characteristics acquisition unit (the calculation results of the calculation unit), and the judgment results of the judgment unit.

[0104] The interval setting unit may be capable of setting the intervals between the plurality of indicators displayed on the transmissive display to two intervals: a first interval and a second interval different from the first interval. As an example, the interval setting unit may set the second interval between the plurality of indicators displayed on the transmissive display to be shorter than the first interval between the plurality of indicators displayed on the transmissive display. As another example, the interval setting unit may set the second interval between the plurality of indicators displayed on the transmissive display to be longer than the first interval between the plurality of indicators displayed on the transmissive display.

[0105] Of course, for example, the interval setting unit may be capable of setting a first interval, a second interval, and a third interval different from the first and second intervals for the plurality of indicators displayed on the transmissive display. As an example, the interval setting unit may set the second interval for the plurality of indicators displayed on the transmissive display to be shorter than the first interval for the plurality of indicators displayed on the transmissive display, and may set the third interval for the plurality of indicators displayed on the transmissive display to be longer than the first interval for the plurality of indicators displayed on the transmissive display.

[0106] It should be noted that the interval setting unit may set the intervals of at least some of the indicators at different intervals in the first interval of the plurality of indicators and the second interval of the plurality of indicators. Furthermore, the interval setting unit may set the intervals of at least some of the indicators at different intervals in the first interval of the plurality of indicators, the second interval of the plurality of indicators, and the third interval of the plurality of indicators. For example, the intervals of the plurality of indicators may be set to different intervals only near the center of the indicator pattern formed by the arrangement of the plurality of indicators.

[0107] <Interval switching unit>

[0108] The spectacle lens measurement device in this embodiment includes an interval switching unit (e.g., the control unit 70). The interval switching unit switches between a first mode (e.g., a normal mode) in which a first interval between multiple indicators is set by the interval setting unit, and a second mode (e.g., a wide interval mode) in which a second interval between multiple indicators is set by the interval setting unit. For example, the interval switching unit switches between the first and second modes based on an instruction signal for switching between the first and second modes. As an example, the measurement switching unit may switch between the first and second modes based on an instruction signal input by an operator operating an operation unit. Alternatively, as an example, the interval switching unit may switch between the first and second modes based on an instruction signal output based on a detection result of a detector. For example, in this case, the interval switching unit may switch between the first and second modes based on an instruction signal output based on the detection result of the detector. More specifically, the interval switching unit may switch between the first and second modes based on an instruction signal output based on at least one of the detection result of the indicator pattern image detection unit, the acquisition result of the optical characteristics acquisition unit (the calculation result of the calculation unit), and the determination result of the determination unit. This makes it possible to apply an appropriate mode to the spectacle lens and easily obtain the optical characteristics of the spectacle lens.

[0109] <Display Control Unit>

[0110] The spectacle lens measuring device in this embodiment includes a display control unit (e.g., control unit 70). The display control unit controls the display of multiple indicators on the transmissive display. That is, the display control unit controls the display of indicator patterns on the transmissive display. The display control unit can display the indicator pattern by displaying multiple indicators at predetermined positions on the transmissive display. The predetermined positions can be positions specified by the operator or pre-set positions. In addition, the display control unit can display the indicator pattern by displaying multiple indicators at intervals set by the interval setting unit. In other words, the display control unit can use different indicator patterns corresponding to various spectacle lenses.

[0111] For example, the display control unit can display an arrangement of multiple indicators, i.e., an indicator pattern, on a transmissive display. Furthermore, for example, the display control unit can disable the arrangement of multiple indicators, i.e., the indicator pattern, on a transmissive display. It should be noted that, for example, the display control unit can partially display multiple indicators and partially disable multiple indicators on a transmissive display, thereby partially displaying the indicator pattern (or partially disable the indicator pattern).

[0112] In this embodiment, the display control unit displays an indicator pattern on a transmissive display, and the optical characteristics acquisition unit, described later, acquires the optical characteristics of the spectacle lens. For example, if the transmissive displays are positioned at different positions along the optical axis, the display control unit displays the first indicator pattern on the transmissive display capable of displaying the first indicator pattern and the second indicator pattern on the transmissive display capable of displaying the second indicator pattern, thereby acquiring the optical characteristics of the spectacle lens by the optical characteristics acquisition unit.

[0113] It should be noted that when the transmissive display is configured at different positions in the optical axis direction, the display control unit can respectively control the display of the first indicator pattern in the transmissive display capable of displaying the first indicator pattern and the display of the second indicator pattern in the transmissive display capable of displaying the second indicator pattern.

[0114] For example, in a transmissive display capable of displaying a first indicator pattern and a transmissive display capable of displaying a second indicator pattern, when one of the first indicator pattern and the second indicator pattern is displayed, at least a portion of the other of the first indicator pattern and the second indicator pattern is set to non-display. As an example, the display control unit may set the second indicator pattern to non-display when the first indicator pattern is displayed, and display the second indicator pattern when the first indicator pattern is set to non-display. In addition, as an example, the display control unit may set the second indicator pattern (in other words, a portion of the multiple indicators) to non-display when the first indicator pattern (in other words, all of the multiple indicators) is displayed, and display the second indicator pattern (in other words, all of the multiple indicators) when the first indicator pattern (in other words, a portion of the multiple indicators) is set to non-display. As a result, the first indicator pattern image and the second indicator pattern image do not overlap, and the position of each indicator pattern image (indicator image) can be accurately detected, so that the optical characteristics are measured with high precision.

[0115] Furthermore, when the transmissive displays are positioned at different positions along the optical axis, the display control unit can simultaneously (substantially simultaneously) control the display of the first indicator pattern on the transmissive display capable of displaying the first indicator pattern and the display of the second indicator pattern on the transmissive display capable of displaying the second indicator pattern. For example, both the first indicator pattern and the second indicator pattern can be displayed on the transmissive display capable of displaying the first indicator pattern and the transmissive display capable of displaying the second indicator pattern. This allows for simultaneous detection of both the first indicator pattern image and the second indicator pattern image, thereby shortening measurement time.

[0116] In this embodiment, the display control unit disables the display of at least a portion of the indicator pattern on the transmissive display, thereby allowing the lens information acquisition unit, described later, to acquire the lens information of the eyeglass lens. For example, when the transmissive displays are arranged at different positions along the optical axis, the display control unit disables the display of at least a portion of the first indicator pattern on the transmissive display capable of displaying the first indicator pattern, and disables the display of at least a portion of the second indicator pattern on the transmissive display capable of displaying the second indicator pattern, thereby enabling the lens information acquisition unit to acquire the lens information of the eyeglass lens.

[0117] It should be noted that, in such a case, the display control unit can set the indicator pattern (in other words, all of the multiple indicators) to non-display in the transmissive display. In addition, in such a case, the display control unit can set a part of the indicator pattern (in other words, a part of the multiple indicators) to non-display. For example, the indicator pattern can be set to non-display only in the area where the lens information of the spectacle lens can be obtained. As an example, only the indicators projected onto the spectacle lens can be set to non-display, and the indicators projected to the outside of the spectacle lens can be displayed. In addition, as an example, only the indicators projected near the invisible mark formed on the spectacle lens can be set to non-display, and the indicators projected to the outside of the invisible mark formed on the spectacle lens can be displayed.

[0118] For example, in this embodiment, the display control unit displays an index pattern on the transmissive display, allowing the optical characteristics of the spectacle lens to be acquired by the optical characteristics acquisition unit (described later). Furthermore, the display control unit disables at least a portion of the index pattern on the transmissive display, allowing the lens information acquisition unit (described later) to acquire the lens information. This allows both the optical characteristics and lens information of the spectacle lens to be acquired using a simple configuration, without requiring separate optical systems for acquiring the optical characteristics and lens information, or requiring complex control.

[0119] In this embodiment, the display control unit can display one of a first indicator pattern formed by indicators having a first interval and a second indicator pattern formed by indicators having a second interval on the transmissive display when the interval switching unit switches to either a first mode in which the first interval of the plurality of indicators is set, or a second mode in which the second interval of the plurality of indicators is set. For example, by appropriately setting the first and second modes, it is possible to accommodate both spectacle lenses for which optical characteristics can be accurately acquired by projecting an indicator pattern having a predetermined interval, and spectacle lenses for which optical characteristics cannot be accurately acquired by projecting an indicator pattern having a predetermined interval.

[0120] <Optical Characteristics Acquisition Unit>

[0121] The spectacle lens measurement device in this embodiment includes an optical characteristics acquisition unit (e.g., the control unit 70). The optical characteristics acquisition unit acquires the optical characteristics of the spectacle lens based on the detection results of the detector. It should be noted that the optical characteristics acquisition unit can acquire the distribution of the optical characteristics of the spectacle lens by acquiring the optical characteristics of multiple locations on the spectacle lens based on the detection results of the detector.

[0122] For example, the optical characteristics acquisition unit can acquire the optical characteristics of the spectacle lens by performing ray tracing processing on the measurement beam from the light source. In this case, the optical characteristics acquisition unit can acquire the optical characteristics of the spectacle lens by determining positional information about the locations where the measurement beam from the light source passes through at least two points along the optical axis. Furthermore, the optical characteristics acquisition unit can use the positional information about the locations where the measurement beam from the light source passes through at least two points along the optical axis to calculate the refractive angle at which the measurement beam from the light source is refracted by the refractive power of the spectacle lens, thereby acquiring the optical characteristics of the spectacle lens.

[0123] As an example, the optical characteristics acquisition unit may acquire the optical characteristics of the eyeglass lens based on positional information of a position where the measuring light beam from the light source passes through the eyeglass lens and positional information of a position where the measuring light beam from the light source passes through a transmissive display. Furthermore, as an example, the optical characteristics acquisition unit may acquire the optical characteristics of the eyeglass lens based on positional information of a position where the measuring light beam from the light source passes through a transmissive display capable of displaying a first indicator pattern and positional information of a position where the measuring light beam from the light source passes through a transmissive display capable of displaying a second indicator pattern.

[0124] It should be noted that in this embodiment, the optical characteristics acquisition unit may acquire the refractive power of the spectacle lens as the optical characteristics of the spectacle lens based on the detection results of the detector. In other words, in this embodiment, the optical characteristics acquisition unit may also serve as a calculation unit that calculates the refractive power of the spectacle lens based on the detection results of the detector.

[0125] <Lens Information Acquisition Unit>

[0126] The eyeglass lens measurement device in this embodiment includes a lens information acquisition unit (e.g., the control unit 70). The lens information acquisition unit acquires lens information, other than optical characteristics, of the eyeglass lens based on the detection results of the detector. For example, the lens information acquisition unit may acquire lens information based on the signal (signal data) detected by the detector. As an example, the lens information acquisition unit may acquire lens information based on the intensity of the signal detected by the detector. Alternatively, for example, the lens information acquisition unit may acquire lens information based on an image (image data) obtained by transforming the signal detected by the detector. As an example, the lens information acquisition unit may acquire lens information based on at least one of luminance information, chroma information, and hue information of the image.

[0127] <Measurement Switching Unit>

[0128] The spectacle lens measurement device in this embodiment includes a measurement switching unit (e.g., the control unit 70). The measurement switching unit switches between a first mode (e.g., an optical characteristics measurement mode) in which the optical characteristics acquisition unit acquires the optical characteristics of the spectacle lens and a second mode (e.g., a lens information acquisition mode) in which the lens information acquisition unit acquires lens information about the spectacle lens. For example, the measurement switching unit switches between the first and second modes based on an instruction signal for switching between the first and second modes. As an example, the measurement switching unit may switch between the first and second modes based on an instruction signal input by an operator operating an operation unit. Alternatively, as an example, the measurement switching unit may switch between the first and second modes based on an instruction signal output based on a detection result of a detector. For example, in this case, the measurement switching unit may switch between the first and second modes based on an instruction signal output based on the detection result of the detector and the acquisition of the optical characteristics of the spectacle lens. Alternatively, in this case, the measurement switching unit may determine the type of the spectacle lens based on the detection result of the detector and switch between the first and second modes based on an instruction signal output based on the determination result. This makes it possible to apply the appropriate mode to the spectacle lens and easily acquire the optical characteristics and lens information of the spectacle lens.

[0129] The present disclosure can be applied to a spectacle lens measuring device equipped with a measuring optical system (e.g., measuring optical system 20) for measuring the optical properties of a spectacle lens. For example, the present disclosure can be applied to a cup mounting device that projects a measuring beam from a light source toward a spectacle lens, detects the measuring beam that has passed through the spectacle lens with a detector, thereby measuring the optical properties of the spectacle lens, and then mounts a cup used for processing the periphery of the spectacle lens based on the measurement results.

[0130] It should be noted that the present disclosure is not limited to the devices described in this embodiment. For example, terminal control software (program) that performs the functions of the above-described embodiment can be supplied to a system or device via a network or various storage media, and a control device (e.g., a CPU) of the system or device can read and execute the program.

[0131] <Example>

[0132] In this embodiment, the left-right direction of the measuring device 1 is represented as the X direction, the up-down direction (vertical direction) is represented as the Y direction, and the front-back direction is represented as the Z direction.

[0133] Figure 1 2 is an external view of the measurement device 1. For example, the measurement device 1 includes a housing 2, a storage unit 3, a monitor 4, and the like.

[0134] The housing 2 has a storage section 3 within it. The storage section 3 accommodates the eyeglass support unit 10 and the lens measurement unit (described later). The monitor 4 displays various information (e.g., the optical characteristics of the eyeglass lens LE, the distribution of the optical characteristics of the eyeglass lens LE, the invisible marker image 65 of the eyeglass lens LE, etc.). The monitor 4 is a touch panel. In other words, the monitor 4 also functions as an operating unit, used when the operator makes various settings (e.g., changing the interval between indicators, starting measurement, switching modes, etc.). Signals corresponding to the operator's operational instructions input from the monitor 4 are output to the control unit 70 (described later).

[0135] Figure 2 It is a schematic diagram of the eyeglass support unit 10 and the lens measuring unit.

[0136] <Support Unit>

[0137] The glasses support unit 10 is used to place the glasses F. For example, the glasses support unit 10 includes positioning pins 11 , a front support portion 12 , a rear support portion 13 , and the like.

[0138] The positioning pins 11 abut against the rear surface of the eyeglass lens LE of the glasses F. The positioning pins 11 maintain a constant positional relationship between the eyeglass lens LE and the later-described transmissive display 24. The positioning pins 11 also maintain a constant positional relationship between the eyeglass lens LE and the later-described imaging element 27.

[0139] The front support portion 12 supports a portion that is further forward than the center in the front-to-back direction (i.e., the direction in which the temples FT of the glasses F extend) of the glasses F when the glasses F are worn. For example, the front support portion 12 supports the bridge FB of the glasses F. It should be noted that the front support portion 12 is not limited to this embodiment, and may also support the frame of the glasses F as an example. The rear support portion 13 supports a portion that is further backward than the center in the front-to-back direction of the glasses F when the glasses F are worn. For example, the rear support portion 13 supports the temples FT of the glasses F. It should be noted that the rear support portion 13 is not limited to this embodiment, and may also support the temples FT of the glasses F as an example. For example, in this embodiment, the glasses F are placed by the front support portion 12 and the rear support portion 13 in a manner such that the upper end of the frame of the glasses F faces upward and the lower end of the frame of the glasses F faces downward.

[0140] It should be noted that the front support portion 12 and the rear support portion 13 can be configured in a manner that allows them to move toward the base 5. For example, the front support portion 12 can be configured in a manner that allows it to move in the up-down direction (Y direction) by a driving mechanism not shown in the figure. In addition, for example, the rear support portion 13 can be configured in a manner that allows it to move in the up-down direction (Y direction) by a driving mechanism not shown in the figure. For example, by moving at least one of the front support portion 12 and the rear support portion 13 in the up-down direction, the forward tilt angle of the glasses F in the state where the glasses F are worn can be adjusted. In addition, for example, by moving at least one of the front support portion 12 and the rear support portion 13 in the up-down direction, the rear surface of the glasses lens LE of the glasses F and the bottom surface of the positioning pin 11 can be made parallel (approximately parallel).

[0141] <Lens Measurement Unit>

[0142] The lens measuring unit is used to measure the optical characteristics of the eyeglass lens LE fitted to the eyeglasses F. The lens measuring unit is also used to detect information other than the optical characteristics of the eyeglass lens LE fitted to the eyeglasses F. For example, the lens measuring unit includes a measuring optical system 20 .

[0143] In this embodiment, a configuration is described as an example in which the measurement optical system 20 includes a light source 21 that serves as both a light source for irradiating a measuring beam onto the left lens LE1 of the glasses F and a light source for irradiating a measuring beam onto the right lens LEr of the glasses F. Furthermore, in this embodiment, a configuration is described as an example in which the measurement optical system 20 includes an imaging element 27 that serves as both an imaging element for detecting the measuring beam irradiated onto the left lens LE1 of the glasses F and an imaging element for detecting the measuring beam irradiated onto the right lens LEr of the glasses F. It should be noted that the measurement optical system 20 is not limited to this configuration; various configurations may be employed. For example, the measurement optical system 20 includes a light source 21, a half mirror 22, a collimating lens 23, a transmissive display 24, a retroreflective member 25, an imaging element 27, and the like.

[0144] The light source 21 irradiates a measuring beam toward the eyeglass lens LE of the eyeglasses F. The collimator lens 23 shapes the measuring beam from the light source 21 to be parallel (substantially parallel) to the optical axis N1.

[0145] The transmissive display 24 is a high-transmittance display that allows the measuring beam from the light source 21 to pass through it. The transmissive display 24 can display an indicator pattern 30, described below. For example, by displaying the indicator pattern 30 on the transmissive display 24, when the measuring beam from the light source 21 passes through the transmissive display 24, the indicator pattern 30 is formed in the measuring beam. It should be noted that, for example, if the transmissive display 24 is set to non-display mode, the measuring beam from the light source 21 passes directly through the transmissive display 24, and the indicator pattern 30 is not formed in the measuring beam.

[0146] In this embodiment, a first transmissive display 24a and a second transmissive display 24b are provided as the transmissive display 24. The first transmissive display 24a and the second transmissive display 24b are arranged so that their upper and lower centers and left and right centers are aligned with the optical axis L1. Furthermore, the first transmissive display 24a and the second transmissive display 24b are arranged with a predetermined distance ΔD between them in the direction of the optical axis N1.

[0147] The retroreflective member 25 reflects the measurement light beam from the light source 21 in the same (substantially the same) direction as the incident direction, thereby illuminating the rear surface of the eyeglass lens LE of the glasses F. It should be noted that the retroreflective member 25 may also be rotated at high speed by a drive mechanism 26 (e.g., a motor, etc.). This can make uniform the uneven reflection caused by variations in the distribution of the glass beads (not shown) and the reflective film (not shown) included in the retroreflective member 25.

[0148] The imaging element 27 captures the reflected light beam from the light source 21 after being reflected by the retroreflective member 25. The imaging element 27 is focused near the front surface of the eyeglass lens LE of the glasses F. Therefore, for example, invisible markings formed on the eyeglass lens LE of the glasses F are captured in a roughly focused state.

[0149] For example, the measuring light beam from the light source 21 passes through the half mirror 22, is converted into a parallel beam by the collimator lens 23, and reaches the eyeglass lens LE of the glasses F. Next, the measuring light beam converges or diverges due to the refractive power of the eyeglass lens LE while passing through the eyeglass lens LE, transmits through the transmissive display 24, and reaches the retroreflective member 25. The measuring light beam is further reflected by the retroreflective member 25, passes again through the transmissive display 24, the eyeglass lens LE, and the collimator lens 23, and is reflected by the half mirror 22 before reaching the imaging element 27. The imaging element 27 captures the measuring light beam that has passed through each component.

[0150] <Indicator Pattern>

[0151] Figure 3A 、 Figure 3B and Figure 3C This is an example of an indicator pattern 30 that can be displayed on the transmissive display 24. Here, the first indicator pattern 30a that can be displayed on the first transmissive display 24a is used as an example. It should be noted that the second indicator pattern 30b that can be displayed on the second transmissive display 24b has the same structure as described below, so its description is omitted.

[0152] The first transmissive display 24a can display on the screen an indicator 31. The indicator 31 is composed of a peripheral indicator 31a and a reference indicator 31b.

[0153] For example, the peripheral indicators 31a are pre-placed around the reference indicator 31b in a predetermined shape, position, and number. In this embodiment, the peripheral indicators 31a are circular. Furthermore, in this embodiment, the peripheral indicators 31a are disposed in the right region 33a on the side where the left lens LE1 of the glasses F is positioned, and in the left region 33b on the side where the right lens LEr of the glasses F is positioned. It should be noted that the peripheral indicators 31a are disposed in the right region 33a and the left region 33b so as to be bilaterally symmetrical about an axis in the vertical direction (Y direction) passing through the passage position I of the optical axis L1. Furthermore, in this embodiment, a large number of peripheral indicators 31a are disposed.

[0154] For example, the reference indicators 31b may be pre-set in a predetermined shape, position, and number, as long as they can be distinguished from the peripheral indicators 31a. In this embodiment, the reference indicators 31b are formed in a circular shape that is larger than the peripheral indicators 31a. Furthermore, in this embodiment, the reference indicators 31b are arranged in the right region 33a and the left region 33b so as to be bilaterally symmetrical about an axis in the vertical direction (Y direction) passing through the through position I of the optical axis L1. Furthermore, in this embodiment, four reference indicators 31b are arranged in each region. For example, the reference indicators 31b make it easy to determine the positional relationship between the peripheral indicators 31a.

[0155] The first transmissive display 24a displays a plurality of indicators 31 to represent a first indicator pattern 30a formed by the plurality of indicators 31. As an example, the first indicator pattern 30a can be represented as follows: Figure 3A As shown in FIG. 3 , the intervals between the plurality of indicators 31 are set to the first indicator pattern 30a of the distance S1. Figure 3B The first indicator pattern 30a is such that the intervals between the plurality of indicators 31 are set to a distance S2 shorter than the distance S1. Figure 3C Thus, the first indicator pattern 30a is formed by setting the intervals between the plurality of indicators 31 to a distance S3 longer than the distance S1. For example, the display and non-display of the plurality of indicators 31 are controlled by the control unit 70 described later.

[0156] It should be noted that the first transmissive display 24a can arrange each indicator 31 at equal intervals, using each indicator 31 as a display unit (segment). The first indicator pattern 30a formed by the multiple indicators 31 can be displayed by varying whether or not a voltage is applied to each segment. In other words, the first transmissive display 24a can display the first indicator pattern 30a formed by the multiple indicators 31 through segment display. For example, when a voltage is applied to a segment, the indicator 31 is displayed. For example, when no voltage is applied to the segment or when voltage application to the segment is stopped, the indicator 31 is not displayed. For example, each indicator 31 can be displayed by printing.

[0157] For example, if a voltage is applied to all segments provided in the first transmissive display 24a, the indicators 31 are displayed in all segments. In this case, a first indicator pattern 30a can be displayed in which the multiple indicators 31 are spaced a predetermined distance apart (i.e., the shortest distance that can be represented by the multiple indicators 31). Furthermore, if a voltage is applied to a specific segment provided in the first transmissive display 24a, the indicators 31 are displayed only in the specific segment. In this case, as an example, a voltage can be applied to every other segment to display a first indicator pattern 30a in which the multiple indicators 31 are spaced a distance longer than the aforementioned shortest distance. Of course, a voltage can also be applied to every second, third, fourth, or other segments to display a first indicator pattern 30a in which the multiple indicators 31 are spaced a longer distance apart.

[0158] In this embodiment, the first indicator pattern 30a of the first transmissive display 24a and the second indicator pattern 30b of the second transmissive display 24b are configured as the same pattern. Specifically, the shapes of the indicators 31 in the first indicator pattern 30a and the second indicator pattern 30b are identical. Furthermore, the positions of the indicators 31 in the first indicator pattern 30a and the second indicator pattern 30b are identical. Furthermore, the number of indicators 31 in the first indicator pattern 30a and the number of indicators 31 in the second indicator pattern 30b are identical.

[0159] However, in this embodiment, the first indicator pattern 30a of the first transmissive display 24a and the second indicator pattern 30b of the second transmissive display 24b may be configured such that at least a portion of the pattern is different. In other words, the shapes of the indicators 31 in the first indicator pattern 30a and the second indicator pattern 30b may be different. Furthermore, the positions of the indicators 31 in the first indicator pattern 30a and the second indicator pattern 30b may be different. Furthermore, the number of indicators 31 in the first indicator pattern 30a and the number of indicators 31 in the second indicator pattern 30b may be different.

[0160] <Indicator pattern image>

[0161] For example, when the measuring light beam from the light source 21 is imaged by the imaging element 27 , the control unit 70 described later processes the electric signal to obtain a captured image.

[0162] Figure 4A and Figure 4B This is an example of a captured image obtained by displaying the first indicator pattern 30 a on the first transmissive display 24 a . Figure 4A The glasses F are not placed on the glasses support unit 10 . Figure 4BThe glasses F are shown in a state where they are placed on the glasses support unit 10 . Figure 5A and Figure 5B This is an example of a captured image obtained by displaying the second indicator pattern 30b on the second transmissive display 24b. Figure 5A The glasses F are not placed on the glasses support unit 10 . Figure 5B The glasses F are shown in a state where they are placed on the glasses support unit 10 .

[0163] It should be noted that in Figure 4A 、 Figure 4B 、 Figure 5A and Figure 5B In FIG, the case where the glasses lens LE of the glasses F is a concave lens is taken as an example, and the captured image of the right lens LEr of the glasses F is shown. Figure 4A 、 Figure 4B 、 Figure 5A and Figure 5B In the figure, for convenience, the shape of the first indicator pattern 30a and the shape of the second indicator pattern 30b are shown as different shapes.

[0164] First, the reference state in which the glasses F are not placed on the glasses support unit 10 will be described. If the first indicator pattern 30a is displayed on the first transmissive display 24a in the reference state, the measurement light beam from the light source 21 is formed in the shape of the first indicator pattern 30a. Figure 4A As shown in FIG. 1 , a reference image B1 including an image of the first indicator pattern 30a (hereinafter referred to as the first indicator pattern image 41) is obtained as a captured image. In addition, if the second indicator pattern 30b is displayed on the second transmissive display 24b in the reference state, the measurement light beam from the light source 21 is formed in the shape of the second indicator pattern 30b. Therefore, as shown in FIG. Figure 5A As shown, a reference image B2 including an image of the second indicator pattern 30 b (hereinafter, referred to as a second indicator pattern image 51 ) is acquired as a captured image.

[0165] It should be noted that in this embodiment, the positions and number of the multiple indicators 31 in the first indicator pattern 30a are identical to the positions and number of the multiple indicators 31 in the second indicator pattern 30b. Therefore, in the reference state, the pixel positions of the respective indicator images in the reference image B1 and the respective indicator images in the reference image B2 are identical. For example, the pixel position of point P1 corresponding to the fourth indicator image from the left and third from the top in the first indicator pattern image 41 is identical to the pixel position of point P2 corresponding to the fourth indicator image from the left and third from the top in the second indicator pattern image 51.

[0166] Next, the measurement state in which the glasses F are placed on the glasses support unit 10 will be described. When the first indicator pattern 30a is displayed on the first transmissive display 24a in the measurement state, the measurement light beam from the light source 21 is formed in the shape of the first indicator pattern 30a. In addition, the measurement light beam from the light source 21 is refracted and diverged by the refractive power of the glasses lens LE. Therefore, Figure 4B As shown, a measurement image M1 is obtained as a captured image, which includes the first index pattern image 41, at least a portion of which is circularly reduced compared to the reference state, and the image of the right lens LEr (hereinafter referred to as the right lens image 60). In addition, if the second index pattern 30b is displayed on the second transmissive display 24b in the measurement state, the measurement light beam from the light source 21 is formed into the shape of the second index pattern 30b, and the measurement light beam from the light source 21 is refracted and diverged by the refractive power of the eyeglass lens LE. Therefore, as shown in FIG. Figure 5B As shown, a measurement image M2 of the second indicator pattern image 51 and the right lens image 60 , at least a portion of which is reduced in a circular shape compared to the reference state, is acquired as a captured image.

[0167] It should be noted that in this embodiment, the transmissive displays are arranged so that the distance from the spectacle lens LE to the second transmissive display 24b is greater than the distance from the spectacle lens LE to the first transmissive display 24a. Therefore, in the measurement state, the second indicator pattern image 51 in the measurement image M2 appears smaller than the first indicator pattern image 41 in the measurement image M1, and the pixel positions of the indicator images in the measurement image M1 and the pixel positions of the indicator images in the measurement image M2 are different. For example, the pixel position of point P1' corresponding to the fourth indicator image from the left and third from the top in the first indicator pattern image 41 is different from the pixel position of point P2' corresponding to the fourth indicator image from the left and third from the top in the second indicator pattern image 51.

[0168] For example, in the above description, the spectacle lens LE of the glasses F is a concave lens. However, if the spectacle lens LE is a convex lens, the measurement light beam from the light source 21 is refracted and converged by the refractive power of the spectacle lens LE. Therefore, in the measurement state, the first index pattern image 41 and the second index pattern image 51 are acquired, at least partially enlarged in a circular shape compared to the reference state. The second index pattern image 51 in the measurement image M2 appears larger than the first index pattern image 41 in the measurement image M1. Furthermore, if the spectacle lens LE is an astigmatic spectacle lens, the first index pattern image 41 and the second index pattern image 51 are acquired, at least partially altered in an elliptical shape compared to the reference state. Furthermore, if the spectacle lens LE is a progressive addition spectacle lens, the first index pattern image 41 and the second index pattern image 51 are acquired, varying in accordance with the refractive power of the progressive zone.

[0169] <Control Unit>

[0170] Figure 6 1 is a diagram showing a control system of the measuring device 1. For example, the monitor 4, the light source 21, the drive mechanism 26, the imaging element 27, the first transmissive display 24a, the second transmissive display 24b, and a nonvolatile memory 75 (hereinafter referred to as the memory 75) are electrically connected to the control unit 70.

[0171] For example, the control unit 70 is implemented by a typical CPU (processor), RAM, ROM, and the like. For example, the CPU controls the operation of various components within the measurement device 1. For example, the RAM temporarily stores various information. For example, the ROM stores various programs executed by the CPU. It should be noted that the control unit 70 may also be composed of multiple control units (that is, multiple processors).

[0172] Memory 75 may be a non-transitory storage medium capable of retaining stored content even when power is cut off. For example, a hard disk drive, a flash ROM, or a USB memory device may be used as memory 75. For example, memory 75 stores reference images B1 and B2 in the reference state, and measurement images M1 and M2 in the measurement state.

[0173] <Control Action>

[0174] The control operation of the measurement device 1 will be described.

[0175] The operator receives the glasses F from the wearer and places them on the glasses support unit 10 . The operator also moves at least one of the front support 12 , the rear support 13 , and the positioning pins 11 to complete the alignment of the glasses F and the measuring optical system 20 .

[0176] Next, the operator sets the spectacle lens LE of the glasses F to either an optical characteristics measurement mode for obtaining the optical characteristics thereof or a lens information acquisition mode for obtaining lens information different from the optical characteristics thereof. The operator operates the monitor 4 to select a mode setting button (not shown). The control unit 70 sets either the optical characteristics measurement mode or the lens information acquisition mode based on an input signal from the monitor 4.

[0177] <Obtaining Optical Properties of Eyeglass Lenses>

[0178] The optical characteristics measurement mode will be described in detail below. In this mode, the first and second transmissive displays 24a and 24b are displayed, and the first and second indicator patterns 30a and 30b are projected onto the eyeglass lens LE to obtain the optical characteristics of the eyeglass lens LE. In this embodiment, when the first transmissive display 24a is displayed, the second transmissive display 24b is turned off. When the first transmissive display 24a is turned off, the second transmissive display 24b is displayed. The first and second indicator patterns 30a and 30b are sequentially projected onto the eyeglass lens LE to obtain the optical characteristics of the eyeglass lens LE.

[0179] When the optical characteristics measurement mode is set, the control unit 70 illuminates the light source 21. Furthermore, the control unit 70 displays the predetermined first indicator pattern 30a on the first transmissive display 24a. The second transmissive display 24b is set to off, preventing the predetermined second indicator pattern 30b from being displayed. The measurement beam from the light source 21 diverges, is shaped into a parallel pattern by the collimating lens 23, and then simultaneously irradiates the left lens LE1 and the right lens LEr. Furthermore, the measurement beam from the light source 21 is refracted by the left lens LE1 and the right lens LEr, and formed into the shape of the first indicator pattern 30a by passing through the first transmissive display 24a. The beam directly passes through the second transmissive display 24b, is reflected back in its original direction by the retroreflective member 25, and reaches the imaging element 27. Based on the image captured by the imaging element 27, the control unit 70 obtains a measurement image M1 comprising the first indicator pattern image 41 and the left and right lens images 60. Furthermore, the control unit 70 stores the measurement image M1 in the memory 75.

[0180] Next, the control unit 70 turns off the first transmissive display 24a and displays the predetermined second indicator pattern 30b on the second transmissive display 24b. Consequently, the measurement light beam from the light source 21, refracted by the left lens LE1 and the right lens LEr, passes directly through the first transmissive display 24a. It is then transformed into the second indicator pattern 30b by the second transmissive display 24b and reflected back in its original direction by the retroreflective member 25 before reaching the imaging element 27. Based on the image captured by the imaging element 27, the control unit 70 obtains a measurement image M2 comprising the second indicator pattern image 51, the left lens image, and the right lens image 60. Furthermore, the control unit 70 stores the measurement image M2 in the memory 75.

[0181] The control unit 70 obtains the optical characteristics of the left lens LE1 and the right lens LEr based on the measurement images M1 and M2. For example, the control unit 70 obtains the optical characteristics of the left lens LE1 and the right lens LEr based on the amount of change in the intervals between the index images forming the first index pattern image 41 and the second index pattern image 51.

[0182] Figure 7 This is a schematic diagram illustrating the measurement beam from light source 21. For example, the measurement beam (light ray R1) from light source 21 is refracted by passing through point Q1 on the eyeglass lens LE. Note that the XY position of point Q1 on the eyeglass lens LE corresponds to the pixel position of a predetermined index image in reference image B1 (e.g., the pixel position of point P1) and the pixel position of a predetermined index image in reference image B2 (e.g., the pixel position of point P2). Therefore, the position can be determined based on either reference image B1 or reference image B2.

[0183] The control unit 70 detects where in the measurement image M1 the indicator images of the reference image B1 in the reference state have moved due to the placement of the glasses F, thus entering the measurement state. For example, the control unit 70 detects the pixel positions of the respective indicator images forming the first indicator pattern image 41 in the measurement image M1. Furthermore, for example, the control unit 70 compares the pixel positions of the respective indicator images in the measurement image M1 with the pixel positions of the respective indicator images in the reference image B1. Thus, for example, the control unit 70 detects that the light beam R1 has passed through the first transmissive display 24a and that point P1 in the reference image B1 has moved to point P1' in the measurement image M1.

[0184] Similarly, the control unit 70 detects where the index image of the reference image B2 in the reference state has moved to within the measurement image M2 due to the placement of the glasses F and the transition to the measurement state. For example, the control unit 70 detects the pixel positions of each index image forming the second index pattern image 51 in the measurement image M2 and compares them with the pixel positions of each index image in the reference image B2. This can detect, for example, that light beam R1 has passed through the second transmissive display 24b and that point P2 in the reference image B2 has moved to point P2' in the measurement image M2.

[0185] Next, the control unit 70 calculates the refractive angle θ of the light ray R1 from the light source 21 when it is refracted by the eyeglass lens LE. For example, the refractive angle θ of the light ray R1 can be calculated using a trigonometric function using the distance ΔD from the first transmissive display 24a to the second transmissive display 24b, the position of point P1' in the XY directions where the light ray R1 passes through the first transmissive display 24a, and the position of point P2' in the XY directions where the light ray R1 passes through the second transmissive display 24b.

[0186] The control unit 70 calculates the respective refractive angles (i.e., angle θ1 and angle θ2) at which the measurement light beam from the light source 21 is refracted by passing through the positions of at least two points on the spectacle lens LE (in this embodiment, point Q1 and point Q2, which is different from point Q1) as described above. Furthermore, the control unit 70 calculates the position of the focal length f of the spectacle lens LE and the position of the optical center O of the spectacle lens LE based on the positions of the at least two points on the spectacle lens LE. For example, the position of the focal length f of the spectacle lens LE and the position of the optical center O of the spectacle lens LE can be calculated using the following mathematical formula.

[0187] Mathematical formula 1

[0188]

[0189] Mathematical formula 2

[0190] O=f tanθ1+Q1

[0191] Note that the position of the optical center O of the spectacle lens LE can also be determined using the position of the point Q2 where the light ray R2 passes through the spectacle lens LE and the refractive angle θ2 at which the light ray R2 is refracted by the spectacle lens LE.

[0192] Figure 8 The control unit 70 sets two arbitrary points (at a predetermined distance from the optical center O of the eyeglass lens LE in a predetermined meridian direction) at a predetermined distance from the optical center O of the eyeglass lens LE. Figure 8 ( hereinafter referred to as "points C1 and C2"). For example, the control unit 70 sets a predetermined meridian direction at intervals of a predetermined angle α. Specifically, if the predetermined angle α is 45 degrees, the meridian directions are set to 0 degrees, 45 degrees, 90 degrees, ..., and 315 degrees, respectively. Alternatively, for example, the control unit 70 sets the predetermined distance so that the distance from the optical center O to point C1 is the same in each meridian direction. Alternatively, for example, the control unit 70 sets the predetermined distance so that the distance from the optical center O to point C2 is the same in each meridian direction.

[0193] Next, the control unit 70 calculates the position of the focal distance f in each meridian direction based on any two points in each meridian direction, and determines the refractive power E of the spectacle lens LE in each meridian direction. The refractive power E of the spectacle lens LE is expressed as the reciprocal of the focal distance f. Furthermore, the control unit 70 creates a coordinate graph with the refractive power E of the spectacle lens LE as the vertical axis and a predetermined angle α as the horizontal axis, and calculates an approximate curve using the least squares method. For example, such an approximate curve is expressed as the following mathematical formula. It should be noted that a, b, and c in the formula are constants.

[0194] Mathematical formula 3

[0195] E(t)=a sin{29t-b)}+c

[0196] The control unit 70 obtains the optical characteristics of the eyeglass lens LE (eg, spherical power, cylindrical power, astigmatism axis angle, etc.) based on the approximate curve. In addition, the control unit 70 displays the optical characteristics of the eyeglass lens LE on the monitor 4 .

[0197] It should be noted that the control unit 70 may also repeatedly calculate the refractive angle and refractive power of the light rays at multiple locations other than the optical center O of the spectacle lens LE, thereby obtaining the distribution of the optical characteristics of the spectacle lens LE. The control unit 70 may also display a mapping image representing the distribution of the optical characteristics of the spectacle lens LE on the monitor 4. For example, the mapping image may be superimposed on the left and right lens images 60 in the measurement image M1 or measurement image M2, thereby being presented together with the image of the spectacle frame. By confirming this information, the operator can understand the optical characteristics of the spectacle lens LE and the distribution of the optical characteristics of the spectacle lens LE.

[0198] <Obtaining Lens Information of Spectacle Lenses>

[0199] The following describes the lens information acquisition mode in detail. In this mode, the first and second transmissive displays 24a and 24b are set to non-display to acquire lens information about the eyeglass lens LE. Note that this example uses the case of detecting a hidden marking on the eyeglass lens LE as lens information about the eyeglass lens LE.

[0200] When the lens information acquisition mode is set, the control unit 70 illuminates the light source 21. Furthermore, the control unit 70 turns off the first and second transmissive displays 24a and 24b. Furthermore, the control unit 70 drives the drive mechanism 26, causing the retroreflective member 25 to rotate at high speed. The measurement beam from the light source 21 diverges, is shaped into a parallel beam by the collimating lens 23, and then simultaneously illuminates the left and right lenses LE1 and LEr. Furthermore, the measurement beam from the light source 21, refracted by the left and right lenses LE1 and LEr, passes directly through the first and second transmissive displays 24a and 24b, is reflected by the retroreflective member 25 in its original direction, and reaches the imaging element 27. The control unit 70 processes the electrical signal based on the image capture result from the imaging element 27 to acquire the measurement image M3.

[0201] Figure 9This is an example of a measurement image M3. For example, the measurement image M3 is acquired as an image including the left and right lens images 60. It should be noted that in this embodiment, the measurement light beam from the light source 21 is reflected by the retroreflective member 25, thereby illuminating the rear surfaces of the left and right lenses LE1 and LEr. Consequently, a measurement image M3 with high contrast is obtained, clearly showing the spectacle lens images (the left and right lens images 60) and the later-described invisible marker image 65.

[0202] The control unit 70 detects edges based on the rise and fall of luminance in the measurement image M3, thereby detecting the invisible marker image 65. Furthermore, the control unit 70 displays the invisible marker image 65 of the spectacle lens LE on the monitor 4. By checking the invisible marker image 65, the operator can understand the refractive power, addition power, progressive zone length, and other information of the spectacle lens LE.

[0203] It should be noted that in this embodiment, a configuration in which the operator manually sets either the optical characteristics measurement mode or the lens information acquisition mode is used as an example for description, but the present invention is not limited to this configuration. Of course, a configuration in which the control unit 70 automatically sets either the optical characteristics measurement mode or the lens information acquisition mode is also possible. As an example, the control unit 70 may set the lens information acquisition mode based on the type of eyeglass lens LE.

[0204] The control unit 70 obtains a measurement image M1 including the first indicator pattern image 41 and determines the type of the spectacle lens LE based on changes in the spacing between the indicator images forming the first indicator pattern image 41. For example, if the spectacle lens LE is a spherical spectacle lens (concave or convex) or an astigmatic spectacle lens, the spacing between the indicator images forming the first indicator pattern image 41 will be enlarged or reduced at a constant ratio. Therefore, if the distance K1 between the indicator images detected in the measurement image M1 is equidistant (approximately equidistant), the control unit 70 can determine that the spectacle lens LE is a spherical spectacle lens or an astigmatic spectacle lens. Furthermore, if the spectacle lens LE is a progressive addition spectacle lens, for example, the spacing between the indicator images forming the first indicator pattern image 41 decreases from the far point to the near point depending on the refractive power of the progressive zone. Therefore, if the distance K1 between the indicator images detected in the measurement image M1 gradually decreases (or widens), the control unit 70 can determine that the spectacle lens LE is a progressive addition spectacle lens. For example, when the control unit 70 determines that the eyeglass lens LE is a progressive eyeglass lens, the control unit 70 may set the lens information acquisition mode to detect the invisible marker image 65 of the eyeglass lens LE.

[0205] <Changes in indicator intervals>

[0206] When the optical characteristics of the eyeglass lens LE are obtained, the intervals between the index images forming the index pattern image vary significantly depending on the refractive power of the eyeglass lens LE. In particular, the higher the power of the eyeglass lens LE, the stronger the refractive power of the eyeglass lens LE, and therefore the greater the variation in the intervals between the index images.

[0207] For example, if the spectacle lens LE is a concave lens and the higher the power, the smaller the circular shape of the index images, and the closer the index images are to each other. In this case, adjacent index images may overlap or intersect in the measurement image, making it difficult to distinguish between them. For example, if the optical properties of the spectacle lens LE are measured in this state, it is impossible to accurately obtain information on the position of the measurement beam from the light source passing through the transmissive display, making it difficult to maintain consistent measurement accuracy.

[0208] For example, if the spectacle lens LE is a convex lens and the higher the power, the more circular the index images become, and the wider the intervals between them. In this case, a sufficient number of index images may not be obtained in the measurement image. For example, if the optical properties of the spectacle lens LE are measured in this state, the position information of the measurement light beam from the light source passing through the transmissive display is insufficient, making it difficult to maintain consistent measurement accuracy.

[0209] Therefore, in this embodiment, the intervals between the index images in the measurement image are detected, and based on the detection results, the voltage applied to specific segments provided in the transmissive display is controlled. This allows the intervals between the indexes 31 to be changed according to the spectacle lenses LE, thereby displaying an appropriate index pattern.

[0210] The following describes in detail how to change the spacing between the indicators 31, taking as an example the case where the eyeglass lenses LE of the glasses F are concave lenses. For example, in this embodiment, the control unit 70 automatically sets either a normal mode in which the plurality of indicators 31 are displayed on the first and second transmissive displays at predetermined intervals, or a wide-interval mode in which the plurality of indicators 31 are displayed on the first and second transmissive displays at intervals wider than the predetermined interval.

[0211] <Normal Mode>

[0212] The following describes the normal mode in detail. When measuring the optical characteristics of the eyeglass lens LE, the control unit 70 first sets the normal mode. For example, in the normal mode, a voltage is applied to each segment displaying a plurality of indicators 31, and the intervals between the plurality of indicators 31 are set to the first indicator pattern 30a of the predetermined distance S1 (see FIG. Figure 3A) is displayed on the first transmissive display 24a. At this time, a measurement image M1 including the first indicator pattern image 41 in which the intervals between the indicator images (hereinafter referred to as first indicator images) are reduced due to the refractive power of the eyeglass lens LE is obtained. For example, the control unit 70 analyzes the measurement image M1, detects the pixel positions of the first indicator images, and calculates the distance K1 between the first indicator images based on the pixel positions of adjacent first indicator images (refer to Figure 4B ).

[0213] The control unit 70 determines whether the distance K1 between the first indicator images exceeds a predetermined threshold. For example, if the distance K1 between the first indicator images is longer than the predetermined threshold, the control unit 70 determines that the distance K1 is less than the threshold. Alternatively, if the distance K1 between the first indicator images is shorter than the predetermined threshold, the control unit 70 determines that the distance K1 exceeds the threshold. It should be noted that the predetermined threshold may be pre-stored in the memory 75 through experiments, simulations, or the like.

[0214] If the control unit 70 determines that the distance K1 between the first indicator images is less than the threshold, it stores a measurement image M1, which includes the first indicator pattern image 41 with the first indicator images spaced a distance K1 apart, in the memory 75. Next, the control unit 70 applies a voltage to every other segment displaying the plurality of indicators 31, causing the second indicator pattern 30b, in which the plurality of indicators 31 are spaced a predetermined distance S1 apart, to be displayed on the second transmissive display 24b. This acquires a measurement image M2, which includes the second indicator pattern image 51 with the indicator images (hereinafter referred to as the second indicator images) spaced a distance K2 apart, and stores the image in the memory 75. Based on these measurement images M1 and M2, the control unit 70 acquires the optical characteristics of the eyeglass lens LE.

[0215] <Wide Interval Mode>

[0216] The wide-interval mode is described in detail below. For example, the wide-interval mode is set when, in the aforementioned normal mode, it is determined that the distance K1 between the first indicator images exceeds a threshold. For example, in the wide-interval mode, voltage is applied to all segments displaying the multiple indicators 31, and the first indicator pattern 30a is displayed on the first transmissive display 24a, with the multiple indicators 31 spaced apart by a distance greater than the predetermined distance S1.

[0217] For example, if the control unit 70 determines that the distance K1 between the first indicator images exceeds the threshold value, the control unit 70 changes the voltage application to each segment displaying the plurality of indicators 31 in the first transmissive display 24a, and applies the voltage to all segments displaying the plurality of indicators 31. Thus, for example, the first indicator pattern 30a (see FIG. 1 ) in which the intervals between the plurality of indicators 31 are set to a distance S3 longer than the predetermined distance S1 is formed. Figure 3C) is displayed on the first transmissive display 24a. At this time, a measurement image M1 is acquired, including the first indicator pattern image 41, in which the distance between the first indicator images is longer than the distance K1 due to the refractive power of the eyeglass lens LE. The control unit 70 stores this measurement image M1 in the memory 75.

[0218] Next, the control unit 70 applies voltage to all segments displaying the plurality of indicators 31, causing the second transmissive display 24b to display the second indicator pattern 30b, in which the plurality of indicators 31 are spaced apart by a distance S3 longer than the predetermined distance S1. This acquires a measurement image M2 including the second indicator pattern images 51 spaced apart by a distance greater than the predetermined distance K2. The control unit 70 stores this measurement image M2 in the memory 75.

[0219] The control unit 70 changes the intervals between the plurality of indices 31 in accordance with the eyeglass lens LE in this manner, thereby acquiring appropriate measurement images M1 and M2 , and acquiring the optical characteristics of the eyeglass lens LE based on these measurement images.

[0220] It should be noted that, while the above description uses the example of setting the wide interval mode when it is determined that the distance K1 between the first indicator images exceeds the threshold, the present invention is not limited to this. For example, the wide interval mode may be set when the distance K1 between the first indicator images is not detected due to, for example, overlapping first indicator images.

[0221] In the above description, a configuration is described as an example in which a first indicator pattern 30a, which shows a plurality of indicators 31 spaced at a predetermined distance S1, is displayed on the first transmissive display 24a, and the mode is automatically switched from the normal mode to the wide-interval mode based on whether the distance K1 between the first indicator images detected at that time exceeds a threshold value. However, the present invention is not limited to this configuration. Of course, a configuration may also be employed in which a second indicator pattern 30b, which shows a plurality of indicators 31 spaced at a predetermined distance S1, is displayed on the second transmissive display 24b, and the mode is automatically switched from the normal mode to the wide-interval mode based on whether the distance K2 between the second indicator images detected at that time exceeds a predetermined threshold value. For example, after obtaining a measurement image M1 in the normal mode and then obtaining a measurement image M2 in the wide-interval mode, the measurement image M1 may be obtained again in the wide-interval mode.

[0222] As described above, for example, the spectacle lens measurement device of this embodiment includes a transmissive display capable of displaying an indicator pattern formed by arranging a plurality of indicators while transmitting a measurement beam from a light source. The transmissive display displays the indicator pattern to obtain the optical characteristics of the spectacle lens, while the transmissive display does not display at least a portion of the indicator pattern to obtain lens information (for example, invisible marking information). This makes it possible to obtain both the optical characteristics and lens information of the spectacle lens using a simple configuration, without requiring separate optical systems for obtaining the optical characteristics and lens information, or requiring complex control.

[0223] Furthermore, for example, the spectacle lens measurement device of this embodiment includes a first transmissive display capable of displaying a first index pattern and a second transmissive display capable of displaying a second index pattern and positioned at a different position along the optical axis from the first transmissive display. The measuring light beam that has passed through the first transmissive display and then the second transmissive display is detected by a detector. For example, by positioning the transmissive displays at different positions along the optical axis, it is possible to accurately acquire the optical properties of the spectacle lens using a simple configuration without requiring a mechanism for moving the spectacle lens or the transmissive display along the optical axis. More specifically, the refractive angle of the measuring light beam from the light source due to the refractive power of the spectacle lens can be determined, and based on this information, the optical properties of the spectacle lens can be accurately acquired.

[0224] Furthermore, for example, in the eyeglass lens measurement device of this embodiment, in a first transmissive display capable of displaying a first index pattern and a second transmissive display capable of displaying a second index pattern, when the first index pattern is displayed, at least a portion of the second index pattern is hidden, and when at least a portion of the first index pattern is hidden, the second index pattern is displayed. This prevents the first and second index pattern images from overlapping, enabling accurate detection of the positions of the respective index pattern images (index images), thereby enabling highly accurate measurement of optical characteristics.

[0225] Furthermore, for example, the spectacle lens measurement device of this embodiment includes a retroreflective member capable of illuminating the spectacle lens by reflecting a measurement beam directed from a light source toward the spectacle lens and passing through the spectacle lens and a transmissive display back in the direction of incidence. The reflected measurement beam from the light source, after being reflected by the retroreflective member, is detected by a detector. This allows the spectacle lens image and the index pattern image (index image) projected onto the spectacle lens to be obtained with high contrast, thereby improving the detection accuracy of these images.

[0226] Furthermore, for example, the spectacle lens measurement device of this embodiment switches between a first mode for acquiring optical properties of a spectacle lens and a second mode for acquiring lens information about the spectacle lens. Thus, for example, the optical properties and lens information of the spectacle lens can be easily acquired by applying the appropriate mode to the spectacle lens.

[0227] Furthermore, the spectacle lens measuring device of this embodiment irradiates measuring beams from a light source toward both the left and right lenses of the spectacle lenses. The measuring beams that have passed through the left lens and a transmissive display, and the measuring beams that have passed through the right lens and a transmissive display, are detected by a detector. Consequently, the measuring optical system can be simplified, and optical properties and lens information of the spectacle lenses can be acquired through simple control. It should be noted that, for example, a configuration in which the measuring beams are irradiated simultaneously toward both the left and right lenses of the spectacle lenses eliminates the need for a mechanism for moving the spectacle lenses, as is required in a configuration in which the measuring beams are irradiated sequentially toward the left and right lenses. Consequently, the measuring optical system can be simplified, and optical properties and lens information of the spectacle lenses can be acquired through simpler control.

[0228] Furthermore, for example, the spectacle lens measurement device of this embodiment can arbitrarily set the spacing between multiple indicators, allowing an indicator pattern formed by arranging multiple indicators at arbitrary spacing to be displayed on a transmissive display. This allows for obtaining an appropriate indicator pattern image corresponding to the spectacle lens, enabling highly accurate acquisition of optical characteristics. Furthermore, even when measuring a wide range of optical characteristics of a spectacle lens or acquiring the distribution of optical characteristics of a spectacle lens, highly accurate optical characteristics can be acquired.

[0229] Furthermore, for example, the spectacle lens measurement device of this embodiment sets the spacing between the indicators forming the index pattern based on the detection results of a detector that detects the measurement beam from the light source. This automatically sets the spacing between the indicators, making it possible to easily acquire an index pattern image appropriate for the spectacle lens.

[0230] Furthermore, for example, the spectacle lens measurement device of this embodiment detects an index pattern image obtained by projecting an index onto a spectacle lens, and sets the spacing between the multiple indexes forming the index pattern based on the detection results of the index pattern image. For example, this makes it possible to appropriately set the spacing between the indexes corresponding to the spectacle lens based on the spacing and shape of the multiple index images in the index pattern image projected onto the spectacle lens. Furthermore, for example, this makes it possible to obtain an appropriate index pattern image corresponding to the spectacle lens and accurately determine the optical characteristics of the spectacle lens.

[0231] Furthermore, for example, the spectacle lens measurement device of this embodiment sets the intervals between the multiple indicators forming the index pattern based on whether the detector's detection results exceed a predetermined threshold. This automatically switches the intervals between the multiple indicators depending on the spectacle lens, making it easy to acquire an appropriate index pattern image corresponding to the spectacle lens and accurately determine the optical properties of the spectacle lens. This setting of the index intervals is particularly effective in a fully automated device that automatically performs optical property measurements from the start to the completion of a spectacle lens placement.

[0232] Furthermore, for example, the spectacle lens measurement device of this embodiment can set a first spacing between the multiple indices forming the index pattern and a second spacing different from the first spacing between the multiple indices. Thus, it is possible to use at least two different spacings between the indices to accommodate a variety of spectacle lenses.

[0233] Furthermore, for example, the spectacle lens measurement device of this embodiment displays one of a first index pattern formed by a plurality of indices at a first interval and a second index pattern formed by a plurality of indices at a second interval on a transmissive display, depending on the switching mode. Thus, for example, the device can accommodate spectacle lenses for which optical characteristics can be accurately acquired by projecting an index pattern at a predetermined interval, or for which optical characteristics cannot be accurately acquired by projecting an index pattern at a predetermined interval.

[0234] <Modification>

[0235] It should be noted that in this embodiment, the configuration in which the optical characteristics of a spectacle lens LE mounted on a spectacle frame are measured and the invisible marker image 65 is detected using the measurement optical system 20 is described as an example, but the present invention is not limited to this configuration. For example, in this embodiment, the optical characteristics of an unprocessed spectacle lens not mounted on a spectacle frame can also be measured and the invisible marker image 65 can be detected using the measurement optical system 20. In this case, in addition to the invisible marker image formed on the unprocessed spectacle lens, the lens information of the unprocessed spectacle lens can also include marker points or printed marks on the unprocessed spectacle lens.

[0236] It should be noted that, in this embodiment, a configuration in which the optical characteristics of the eyeglass lens LE are acquired using the measurement optical system 20 having two transmissive displays (a first transmissive display 24a and a second transmissive display 24b) arranged at different positions along the optical axis is used as an example for description, but the present invention is not limited to this configuration. For example, in this embodiment, a configuration in which the optical characteristics of the eyeglass lens LE are acquired using a measurement optical system having a single transmissive display arranged at a predetermined position along the optical axis may also be employed.

[0237] Figure 10 This is an example of a measurement optical system equipped with a single transmissive display. In the case of a measurement optical system equipped with a single transmissive display, a moving mechanism 28 (e.g., a motor) may be provided to move the transmissive display 24' in the direction of the optical axis N1. This allows two measurement images to be obtained at different distances from the eyeglass lens LE to the transmissive display, similar to the case of using two transmissive displays.

[0238] For example, the control unit 70 displays a predetermined indicator pattern on the transmissive display 24' and positions the transmissive display 24' at an initial position T1 close to the eyeglass lens LE. In this state, a measurement image is acquired at the initial position T1, including the indicator pattern image, the left lens image, and the right lens image. Alternatively, for example, while the predetermined indicator pattern is displayed on the transmissive display 24', the control unit 70 controls the movement mechanism 28 to move the transmissive display 24' by a distance ΔD, positioning the transmissive display 24' at a moved position T2 farther from the eyeglass lens LE. In this state, a measurement image is acquired at the moved position T2, including the indicator pattern image, the left lens image, and the right lens image. Based on these measurement images, the control unit 70 determines the position of the focal length f of the eyeglass lens LE, the position of the optical center O of the eyeglass lens LE, the refractive power E of the eyeglass lens LE, and other information, thereby enabling the control unit 70 to acquire the optical characteristics of the eyeglass lens LE.

[0239] It should be noted that, while the above description provides a moving mechanism 28 for moving the transmissive display 24' in the direction of the optical axis N1, a moving mechanism for moving the spectacle lens LE in the direction of the optical axis N1 may also be provided. This allows two measurement images to be obtained at different distances from the spectacle lens LE to the transmissive display, and the optical characteristics of the spectacle lens LE to be determined based on these measurement images.

[0240] In addition, in the above description, a moving mechanism 28 is provided for moving the transmissive display 24' in the direction of the optical axis N1, but a structure in which the transmissive display 24' is not moved may be used. In this case, the optical characteristics of the eyeglass lens LE can be obtained based on the point in the XY direction of the eyeglass lens LE that the measurement light beam from the light source 21 passes through, the point in the XY direction of the transmissive display 24' that passes through, and the distance from the eyeglass lens LE to the transmissive display 24'. For example, by Figure 7 By replacing point P1' of the first transmissive display 24a with point Q1 of the eyeglass lens LE, and replacing the distance ΔD from the first transmissive display 24a to the second transmissive display 24b with the distance from the eyeglass lens LE to the second transmissive display 24b, and performing the same process, the optical characteristics of the eyeglass lens LE can be obtained.

[0241] It should be noted that, in this embodiment, a configuration is described as an example in which the optical path for the measurement beam from the light source 21 to be guided to the left lens LE1 and the right lens LEr is a common optical path, but the present invention is not limited to this. For example, in this embodiment, a configuration may be employed in which the optical path for the measurement beam from the light source to be guided to the left lens LE1 and the optical path for the measurement beam from the light source to be guided to the right lens LEr are different optical paths.

[0242] Figure 11 This is an example of a configuration in which the optical path for the measuring light beam from the light source directed to the left lens LE1 and the optical path for the measuring light beam directed to the right lens LEr are different. The measuring optical system may also include a pair of left and right light sources (a first light source 211 and a second light source 212) and a pair of left and right imaging elements (a first imaging element 271 and a second imaging element 272). For example, the measuring light beam from the first light source 211 is directed to the left lens LE1, and the first imaging element 271 captures the measuring light beam after it passes through the left lens LE1 and the transmissive display 24 and is reflected by the retroreflective member 25. Alternatively, for example, the measuring light beam from the second light source 212 is directed to the right lens LEr, and the second imaging element 272 captures the measuring light beam after it passes through the right lens LEr and the transmissive display 24 and is reflected by the retroreflective member 25.

[0243] For example, in the case of a configuration including a pair of left and right light sources and a pair of left and right imaging elements, at least one of the collimating lens, the transmissive display 24, the retroreflective member 25, etc. may be disposed in the left and right optical paths, or may be used in both the left and right optical paths. Figure 11 In this manner, collimating lenses (collimating lens 231 and collimating lens 232 ) are respectively arranged on the left and right optical paths, and the transmissive display 24 and the retroreflective member 25 are used in both the left and right optical paths.

[0244] For example, by providing a pair of left and right light sources and a pair of left and right collimating lenses, the measuring beam from light source 211 passes near the center of collimating lens 231, and the measuring beam from light source 212 passes near the center of collimating lens 232. This suppresses aberrations caused by the measuring beam from the light source passing through the collimating lenses, minimizing the impact on measurement accuracy. Furthermore, since collimating lenses with small diameters can be used, the measuring optical system can be constructed inexpensively.

[0245] For example, by providing a pair of left and right imaging elements, the number of detector pixels can be effectively used for each of the left lens LE1 and the right lens LEr, making it possible to more accurately detect the position of the index pattern image (index image), thereby improving the accuracy of optical characteristic measurement. For example, if a configuration includes a pair of left and right imaging elements, there is no need to distinguish between the measurement beam passing through the left lens LE1 and the measurement beam passing through the right lens LEr, thereby enabling the acquisition of optical characteristics and lens information of the eyeglass lens LE through simpler control.

[0246] It should be noted that, while the above description uses an example in which the measurement optical system 20 includes a pair of left and right light sources and a pair of left and right imaging elements, the present invention is not limited to this. For example, a single light source and a pair of left and right imaging elements may also be provided. In this case, for example, a half-mirror or the like may be used to split the measurement beam emitted from the light source into a light path directed to the left lens LE1 and a light path directed to the right lens LEr, and the measurement beams passing through each light path may be imaged using the first imaging element 271 and the second imaging element 272. Alternatively, for example, a pair of left and right light sources and a single imaging element may also be provided. In this case, for example, the measurement beam emitted from the light source 211 and directed to the left lens LE1 and the measurement beam emitted from the light source 212 and directed to the right lens LEr may be combined using a half-mirror or the like and imaged using the imaging element.

[0247] It should be noted that in this embodiment, while the optical characteristics of the eyeglass lens LE are obtained by, for example, turning off the second transmissive display 24b while the first transmissive display 24a is on, and turning on the second transmissive display 24b while the first transmissive display 24a is off, the present invention is not limited to this. For example, in this embodiment, the optical characteristics of the eyeglass lens LE can also be obtained by turning on both the first transmissive display 24a and the second transmissive display 24b.

[0248] In this case, the measurement light beam from light source 21 forms first indicator pattern 40a by passing through first transmissive display 24a, and forms second indicator pattern 40b by passing through second transmissive display 24b, thereby obtaining a single measurement image that includes both first indicator pattern image 41 and second indicator pattern image 51. It should be noted that the indicators 31 forming first indicator pattern 40a and the indicators 31 forming second indicator pattern 40b may be of different shapes, positions, or numbers to facilitate differentiation between first indicator pattern image 41 and second indicator pattern image 51 in the measurement image.

[0249] For example, by detecting the first indicator pattern image 41 and the second indicator pattern image 51 from a single measurement image, the control unit 70 can obtain a measurement image M1 including the first indicator pattern image 41 and a measurement image M2 including the second indicator pattern image 51, respectively, similar to the case where one of the two transmissive displays is displayed and the other is hidden. Based on these measurement images, the control unit 70 can determine the position of the focal length f of the spectacle lens LE, the position of the optical center O of the spectacle lens LE, the refractive power E of the spectacle lens LE, and other factors, thereby obtaining the optical characteristics of the spectacle lens LE.

[0250] In addition, while this embodiment describes a configuration in which the invisible marker image 65 of the eyeglass lens LE is detected by disabling both the first and second transmissive displays 24a and 24b, the present invention is not limited to this configuration. For example, in this embodiment, the invisible marker image 65 of the eyeglass lens LE can also be detected by partially disabling the first and second transmissive displays 24a and 24b. In this case, a portion of each transmissive display can be disabled to prevent the first and second indicator pattern images 41 and 51 from overlapping the invisible marker image 65. For example, the control unit 70 can detect the left and right lens images 60 from the measurement image, disable the indicator 31 corresponding to the indicator image located inside the left and right lens images 60, and detect the invisible marker image 65 of the eyeglass lens LE.

[0251] It should be noted that in this embodiment, while the configuration in which the measuring light beam from the light source 21 is reflected by the retroreflective member 25 to illuminate the spectacle lens LE and thereby detect the invisible marker image 65 on the spectacle lens LE has been described as an example, the present invention is not limited to this configuration. For example, in this embodiment, a configuration in which a display is used as a light source, the display is illuminated to illuminate the spectacle lens LE, and an illumination pattern different from the first indicator pattern 30a and the second indicator pattern 30b is displayed on the display to project the illumination pattern onto the spectacle lens LE and thereby detect the invisible marker image 65 on the spectacle lens LE can also be adopted.

[0252] Figure 12 This is an example of a configuration using the display 28 as a light source. For example, when using the display 28 as a light source, the light source 21, the first transmissive display 24a, and the second transmissive display 24b can be placed on the rear surface of the eyeglass lens LE, and the imaging element 27 can be placed on the front surface of the eyeglass lens LE. The measurement light beam emitted from the display 28 is captured by the imaging element 27 via the two transmissive displays and the eyeglass lens LE.

[0253] Figure 13A and Figure 13B This is an example of the irradiation pattern 80 that can be displayed on the display 28 . Figure 13A This is a measurement image M4 obtained when the position of the irradiation pattern 80 displayed on the display 28 is moved. Figure 13B The processed image M5 is obtained by processing a plurality of captured images. The illumination pattern 80 may be an illumination pattern with different brightness and darkness. Figure 13A and Figure 13B In the embodiment, the striped irradiation pattern 80 is taken as an example, but a checkered irradiation pattern or the like may also be used.

[0254] For example, the control unit 70 displays the illumination pattern 80 on the display 28 and disables the first and second transmissive displays 24a and 24b. Consequently, the measuring light beam emitted from the display 28 passes directly through the two transmissive displays, is refracted by the eyeglass lens LE, and reaches the imaging element 27. The control unit 70 processes the electrical signal based on the imaging result of the imaging element 27 to obtain a measurement image M4. For example, the measuring light beam emitted from the display 28 is scattered by a hidden mark (or a scratch on the eyeglass lens LE) formed on the eyeglass lens LE and is not captured by the imaging element 27. Therefore, in the measurement image M4, the hidden mark image 50 is partially visible in the portion where the illumination pattern 80 and the hidden mark image 50 overlap. For example, the control unit 70 can control the display of the display 28 to shift the illumination pattern 80 by a predetermined pixel position each time, thereby obtaining multiple measurement images M4. Alternatively, for example, the control unit 70 can analyze each of the multiple measurement images M4 to obtain a processed image M5, thereby detecting the full shape of the hidden mark image 65. Of course, instead of acquiring a plurality of measurement images M4 , a single measurement image M4 may be acquired and the entire shape of the invisible marker image 65 may be detected by analyzing the image M4 .

[0255] It should be noted that, in a configuration using the display 28 as a light source, by lighting the display 28 and disabling the illumination pattern 80, the spectacle lens LE can be illuminated without projecting the illumination pattern onto the spectacle lens LE. In this state, the display and non-display of the first indicator pattern 30a on the first transmissive display 24a and the display and non-display of the second indicator pattern 30b on the second transmissive display 24b can be controlled to determine the optical characteristics of the spectacle lens LE based on each measurement image. It should be noted that the second transmissive display 24b (display 28) can also be arranged to be movable in the direction of the optical axis N1, thereby also adjusting the calculation of the optical characteristics of the spectacle lens LE and the detection of the invisible marker image 65.

[0256] Furthermore, when the display 28 is used as a light source, the second transmissive display 24b can also be used as the display 28. Specifically, the first transmissive display 24a can display the first indicator pattern 30a to obtain a measurement image M1 including the first indicator pattern image 41, while the display 28 can display the second indicator pattern 30b to obtain a measurement image M2 including the second indicator pattern image 51. This also allows the optical characteristics of the eyeglass lens LE to be determined.

[0257] For example, by using the display 28 as a light source, the spectacle lens image and the index pattern image (index image) projected onto the spectacle lens LE can be obtained with high contrast, thereby improving the detection accuracy of these images. It should be noted that in a configuration where the spectacle lens LE is illuminated by the retroreflective member 25, the optical path of the measurement light beam emitted from the light source 21 must be branched and directed to the imaging element 27, reducing the amount of light. However, when the spectacle lens LE is illuminated by the display 28, for example, the measurement light path emitted from the display 28 can be directed to the imaging element 27 without branching. This can suppress the reduction in light intensity and further improve the detection accuracy of these images.

[0258] It should be noted that in this embodiment, while the first and second transmissive displays 24a and 24b are described as examples, the indicator pattern is displayed in such a manner that the measuring light beam from the light source 21 is blocked by the indicator 31 and transmits through the area other than the indicator 31. However, the present invention is not limited to this configuration. For example, a configuration may also be employed in which the indicator pattern is displayed so that the measuring light beam from the light source 21 transmits through the indicator 31 and blocks the area other than the indicator 31. In this case, dust adhering to the eyeglass lens LE, the transmissive display, and uneven reflection from the retroreflective member 25 are prevented from being reflected into the indicator pattern, thereby enabling more accurate detection of the pixel positions of the indicator images.

[0259] It should be noted that a transmissive display with polarization properties can also be used in this embodiment. In this case, the transmissive display can be configured so that the polarization direction of the eyeglass lens LE corresponds to the Y direction in the measurement device 1. For example, polarized sunglasses only transmit light polarized in the vertical direction of the lens (the Y direction in the measurement device 1). Therefore, by configuring the transmissive display in this manner, even when measuring the optical properties of polarized sunglasses, the measurement beam, polarized by passing through the transmissive display, can be efficiently transmitted.

[0260] It should be noted that, in this embodiment, a configuration in which the spacing between the indicators 31 in the first transmissive display 24a is changed based on the distance K1 between the first indicator images in the measurement image M1 is used as an example for description, but the present invention is not limited to this configuration. In this embodiment, a configuration in which the spacing between the indicators 31 in the first transmissive display 24a is changed based on the shape of the first indicator image in the measurement image M1 may also be employed. For example, the control unit 70 may detect edges and the shape of the first indicator image based on the rise and fall of luminance in the measurement image M1.

[0261] For example, if the spectacle lens LE is a concave lens and the higher the power, the first index images are more reduced by the refractive power of the spectacle lens LE. Consequently, the number of pixels used to represent each first index image on the imaging element 27 decreases. Consequently, the first index images in the measurement image M1 become coarse and distorted. Therefore, the control unit 70 may use the shape of the first index images in the measurement image M1 to determine whether to change the spacing between the indexes 31, and may change the spacing between the indexes 31 if distortion of the first index images is detected.

[0262] It should be noted that in this embodiment, a configuration in which the spacing of the indicators 31 in the first transmissive display 24a is changed based on the detection results of the first indicator images in the measurement image M1 (i.e., the spacing of the first indicator images or the shape of the first indicator images) is used as an example for description, but the present invention is not limited to this. In this embodiment, a configuration in which the spacing of the indicators 31 in the first transmissive display 24a is changed based on the optical characteristics of the eyeglass lens LE can also be employed. In this case, the control unit 70 can first obtain the measurement image M1 regardless of the spacing and shape of the first indicator images in the measurement image M1, and then obtain the measurement image M2 regardless of the spacing and shape of the second indicator images in the measurement image M2. The control unit 70 obtains the optical characteristics of the eyeglass lens LE based on these measurement images M1 and M2. As an example, the refractive power of the eyeglass lens LE is obtained.

[0263] Here, the control unit 70 determines whether the refractive power of the spectacle lens LE exceeds a predetermined threshold value. For example, the control unit 70 may determine that the refractive power of the spectacle lens LE is less than the predetermined threshold value if the refractive power of the spectacle lens LE is less than the predetermined threshold value. Alternatively, for example, the control unit 70 may determine that the refractive power of the spectacle lens LE exceeds the predetermined threshold value if the refractive power of the spectacle lens LE is greater than the predetermined threshold value. For example, if the control unit 70 determines that the refractive power of the spectacle lens LE exceeds the predetermined threshold value, the control unit 70 may change the interval between the indicators 31 on the first and second transmissive displays 24a and 24b, reacquire the measurement images M1 and M2, and thereby acquire the optical characteristics of the spectacle lens LE.

[0264] For example, the spectacle lens measurement device of this embodiment can calculate the diopter of a spectacle lens and, based on the calculated diopter, set the spacing between the multiple indicators forming the index pattern. This allows for the appropriate spacing of the indicators corresponding to the diopter of the spectacle lens. Furthermore, this allows for the acquisition of an appropriate index pattern image corresponding to the spectacle lens, enabling the optical properties of the spectacle lens to be accurately determined.

[0265] Furthermore, in this embodiment, the spacing of the indicators 31 in the first transmissive display 24a can be changed based on the type of the eyeglass lens LE. In this case, the control unit 70 acquires the measurement image M1 regardless of the spacing or shape of the first indicator images in the measurement image M1. For example, the control unit 70 compares the reference image B1 with the measurement image M1 and determines the type of the eyeglass lens LE based on the change in the first indicator images in the measurement image M1 relative to the indicator images in the reference image B1. For example, the control unit 70 may determine that the eyeglass lens LE is a concave lens if the first indicator images in the measurement image M1 are reduced in size relative to the indicator images in the reference image B1. Alternatively, the control unit 70 may determine that the eyeglass lens LE is a convex lens if the first indicator images in the measurement image M1 are magnified relative to the indicator images in the reference image B1.

[0266] For example, the control unit 70 can change the spacing between the indicators 31 on the first and second transmissive displays 24a, 24b when determining that the spectacle lens LE is a concave lens. For example, the spacing between the indicators 31 on the first and second transmissive displays 24a, 24b can be increased. This allows the measurement images M1 and M2 to be acquired, and the optical characteristics of the spectacle lens LE to be determined. Furthermore, for example, the control unit 70 can change the spacing between the indicators 31 on the first and second transmissive displays 24a, 24b when determining that the spectacle lens LE is a convex lens. For example, the spacing between the indicators 31 on the first and second transmissive displays 24a, 24b can be decreased. This allows the measurement images M1 and M2 to be acquired, and the optical characteristics of the spectacle lens LE to be determined.

[0267] For example, the spectacle lens measurement device of this embodiment can determine whether a spectacle lens is a concave lens or a convex lens, and based on the determination result, set the spacing between the multiple indicators forming the index pattern. This allows for the appropriate spacing of the indicators to be set according to the type of spectacle lens. Furthermore, this allows for the acquisition of an appropriate index pattern image corresponding to the spectacle lens, enabling the optical characteristics of the spectacle lens to be accurately determined.

[0268] It should be noted that, in this embodiment, a configuration is described as an example in which a predetermined threshold value is set for changing the interval between the indicators 31 in the first transmissive display 24a, and the interval between the indicators 31 is changed when the predetermined threshold value is exceeded. However, the present invention is not limited to this configuration. For example, in this embodiment, the interval between the indicators 31 can also be changed by using a table that associates the image detection results of the image sensor with the interval between the indicators 31 displayed on the first transmissive display 24a. In other words, the interval between the indicators 31 can also be changed based on the detection results of the image sensor. For example, the table can be pre-set based on the results of experiments or simulations.

[0269] It should be noted that in this embodiment, the configuration in which the normal mode and the wide-interval mode are switched based on the distance K1 between the first indicator images when the eyeglass lens LE is a concave lens is used as an example for explanation, but the present invention is not limited to this. For example, in this embodiment, the configuration in which the normal mode and the narrow-interval mode are switched based on the distance K1 between the first indicator images when the eyeglass lens LE is a convex lens can also be used. For example, in the narrow-interval mode, a voltage can be applied to each segment displaying the multiple indicators 31 every two segments, and the first indicator pattern 30a with the multiple indicators 31 spaced at a distance shorter than the predetermined distance S1 can be displayed on the first transmissive display 24a. Of course, in this embodiment, a configuration in which the normal mode, the wide-interval mode, and the narrow-interval mode are provided and any of these modes is switched based on the distance K1 between the first indicator images can also be used.

[0270] Description of Reference Numerals

[0271] 1 Eyeglass lens measuring device

[0272] 10 glasses support unit

[0273] 20 Measurement Optical System

[0274] 21 Light Source

[0275] 24 Transmissive Display

[0276] 26 Retroreflective components

[0277] 27 Camera Components

[0278] 70 Control Department

[0279] 75 memory.

Claims

1. A spectacle lens measuring device for measuring spectacle lenses, characterized in that: have: a light source for irradiating a measuring beam toward the eyeglass lens; a transmissive display that transmits the measurement light beam from the light source and is capable of displaying an indicator pattern formed by arranging a plurality of indicators; a display control unit, controlling the display of the indicator pattern; a detector for detecting the measuring light beam that has passed through the eyeglass lens and the transmissive display; an optical property acquisition unit that acquires the optical property of the spectacle lens based on the detection result of the detector; and a lens information acquisition unit that acquires lens information of the spectacle lens that is different from the optical characteristics based on the detection result of the detector, The display control unit displays the index pattern, the optical characteristic acquisition unit acquires the optical characteristic, the display control unit hides at least a portion of the index pattern, and the lens information acquisition unit acquires the lens information. The transmissive display includes a first transmissive display capable of displaying a first indicator pattern and a second transmissive display capable of displaying a second indicator pattern and arranged at a position different from that of the first transmissive display in the optical axis direction. The detector detects the measuring light beam that has passed through the first transmissive display and then passed through the second transmissive display.

2. The spectacle lens measuring device according to claim 1, wherein The display control unit controls the display of the first indicator pattern and the display of the second indicator pattern respectively. When the first indicator pattern is displayed, at least a portion of the second indicator pattern is hidden, and when at least a portion of the first indicator pattern is hidden, the second indicator pattern is displayed.

3. The spectacle lens measuring device according to claim 1 or 2, wherein: The transmissive display serves as both a left lens transmissive display that displays the index pattern and projects an index pattern image onto the left lens of the glasses and a right lens transmissive display that displays the index pattern and projects an index pattern image onto the right lens of the glasses.

4. The spectacle lens measuring device according to claim 1 or 2, wherein: The light source is a display capable of irradiating the measuring light beam toward the eyeglass lens to illuminate the eyeglass lens. The detector detects the measuring light beam from the display.

5. The spectacle lens measuring device according to claim 1 or 2, wherein: A retroreflective member is provided for reflecting the measuring light beam, which is irradiated from the light source toward the eyeglass lens and passes through the eyeglass lens and the transmissive display, back in an incident direction, thereby illuminating the eyeglass lens. The detector detects a reflected light beam obtained by reflecting the measuring light beam from the retroreflective member.

6. The spectacle lens measuring device according to claim 1 or 2, wherein: A measurement switching unit is provided for switching between a first mode in which the optical characteristics acquiring unit acquires the optical characteristics of the spectacle lens and a second mode in which the lens information acquiring unit acquires the lens information of the spectacle lens.

7. The spectacle lens measuring device according to claim 1 or 2, wherein: The light source irradiates a measuring beam toward both the left lens and the right lens of the eyeglasses. The detector detects the measurement light beam that has passed through the left lens of the eyeglasses and the transmissive display, and the measurement light beam that has passed through the right lens of the eyeglasses and the transmissive display.

8. The spectacle lens measuring device according to claim 1 or 2, wherein: The light source is a pair of left and right light sources, including a first light source for irradiating the measuring beam toward the left lens of the glasses and a second light source for irradiating the measuring beam toward the right lens of the glasses. The detector detects the measuring light beam emitted from the first light source and passing through the left mirror and the transmissive display, and the measuring light beam emitted from the second light source and passing through the right mirror and the transmissive display.

9. The spectacle lens measuring device according to claim 1 or 2, wherein: The detector is a pair of left and right detectors including a first detector for detecting the measuring beam having passed through the left lens of the glasses and the transmissive display, and a second detector for detecting the measuring beam having passed through the right lens of the glasses and the transmissive display.

10. The spectacle lens measuring device according to claim 1 or 2, wherein: An interval setting unit is provided, the interval setting unit being capable of setting the intervals between the plurality of indicators, The optical characteristics of the spectacle lens are acquired based on the measurement light beam that has passed through the spectacle lens and the transmissive display.

11. The spectacle lens measuring device according to claim 10, wherein The interval setting unit sets the intervals of the plurality of indicators forming the indicator pattern based on a detection result of the detector.

12. The spectacle lens measuring device according to claim 11, wherein An index pattern image detecting unit is provided for detecting an index pattern image obtained by projecting the index pattern onto the eyeglass lens based on a detection result of the detector. The interval setting unit sets the intervals between the plurality of indicators forming the indicator pattern based on a detection result of the indicator pattern image detection unit.

13. The spectacle lens measuring device according to claim 11 or 12, wherein: A calculation unit is provided, the calculation unit calculating the diopter of the spectacle lens based on the detection result of the detector, The interval setting unit sets the intervals between the plurality of indicators forming the indicator pattern based on the calculation result of the calculation unit.

14. The spectacle lens measuring device according to claim 11 or 12, wherein: The interval setting unit sets the intervals between the plurality of indicators forming the indicator pattern based on whether the detection result of the detector exceeds a predetermined threshold value.

15. The spectacle lens measuring device according to claim 11 or 12, wherein: A determination unit is provided for determining whether the spectacle lens is a concave lens or a convex lens based on the detection result of the detector, The interval setting unit sets the intervals of the plurality of indicators forming the indicator pattern based on a determination result of the determination unit.

16. The spectacle lens measuring device according to claim 10, wherein The interval setting unit can set a first interval between the plurality of indicators forming the indicator pattern and a second interval between the plurality of indicators that is different from the first interval.

17. The spectacle lens measuring device according to claim 16, wherein: comprising an interval switching unit configured to switch between a first mode in which the first intervals of the plurality of indicators are set by the interval setting unit and a second mode in which the second intervals of the plurality of indicators are set by the interval setting unit, The display control unit displays one of a first indicator pattern formed by the plurality of indicators having the first interval and a second indicator pattern formed by the plurality of indicators having the second interval on the transmissive display according to the mode switched by the interval switching unit.

18. A spectacle lens measuring device for measuring optical properties of a spectacle lens, characterized in that: have: A transmissive display transmits a measurement beam from a light source and can display an indicator pattern formed by arranging a plurality of indicators; a display control unit, controlling the display of the indicator pattern; and an interval setting unit capable of setting the intervals of the plurality of indicators, The spectacle lens measuring device obtains the optical characteristics of the spectacle lens based on the measurement light beam that has passed through the spectacle lens and the transmissive display. The eyeglass lens measuring device includes a detector for detecting the measuring light beam that has passed through the eyeglass lens and the transmissive display, the transmissive display including a first transmissive display capable of displaying a first indicator pattern and a second transmissive display capable of displaying a second indicator pattern and arranged at a position different from that of the first transmissive display in the optical axis direction, the detector detecting the measuring light beam that has passed through the first transmissive display and then through the second transmissive display.

19. A storage medium storing a spectacle lens measurement program for use in a spectacle lens measurement device comprising a transmissive display that transmits a measurement beam from a light source and displays an indicator pattern formed by arranging a plurality of indicators, the spectacle lens measurement device being used to measure optical characteristics of a spectacle lens, wherein: The spectacle lens measurement program is executed by the processor of the spectacle lens measurement device to cause the spectacle lens measurement device to: A display control step of causing the indicator pattern to be displayed on the transmissive display; and An interval setting step is to set the intervals of the plurality of indicators. The spectacle lens measuring device includes a detector for detecting the measuring light beam that has passed through the spectacle lens and the transmissive display, the transmissive display including a first transmissive display capable of displaying a first indicator pattern and a second transmissive display capable of displaying a second indicator pattern and arranged at a position different from that of the first transmissive display in the optical axis direction, and the spectacle lens measuring program is executed by a processor of the spectacle lens measuring device, causing the detector to detect the measuring light beam that has passed through the first transmissive display and then through the second transmissive display.

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