Optical device

Abstract

Provided is an optical device capable of reliably arranging and holding a first prism and a second prism in a close position and capable of reducing the possibility of breakage due to contact of the two prisms. The first prism (50A) has a first plane (51A) substantially parallel to a first optical axis (AX1) on the side of the second prism (50B), the second prism (50B) has a second plane (51B) substantially parallel to a second optical axis (AX2) on the side of the first prism (50A), and the first prism (50A) and the second prism (50B) are fixed to a prism holder (30) in a state in which the interval of the first plane (51A) and the second plane (51B) is defined by abutting the first plane (51A) and the second plane (51B) to an interval defining member (37).

Description

Technical Field

[0001] This utility model relates to an optical device for measuring color, brightness, etc. by receiving light from a display or other object being measured. Background Technology

[0002] In recent years, a technology called Under Screen Camera (USC) has been developed in the display industry. USC is a technology that places a camera module on the back of the display. This technology is sometimes also referred to as an Under Display Camera.

[0003] Devices employing a USC (Underlying Camera Compartment) have a structure that makes it difficult to visually recognize the camera through a display. In such devices, the portion of the display that overlaps with the camera (referred to as the USC portion) has a different structure than the normal portion of the display that does not overlap with the camera (hereinafter referred to as the normal portion). Therefore, gamma adjustment of the display requires gamma adjustment for each portion of both the USC portion and the normal portion.

[0004] Furthermore, in order to shorten production cycle time, there is sometimes a desire to simultaneously measure the brightness of various parts of both the USC section and the normal section. However, there is a light emission distribution within the surface of the display. Therefore, the normal section, which is the object of measurement, is preferably a part as close as possible to the USC section. In such cases, it is required to simultaneously measure the brightness of two closely spaced parts, such as the USC section and the normal section, with a distance of, for example, 10 mm between them.

[0005] As a technology that can meet the above-mentioned expectations, Patent Document 1 discloses an optical device that uses a prism to measure the brightness of two adjacent parts.

[0006] The optical device includes a photometer, a first optical unit, and a second optical unit. The first optical unit has a first lens on the object side and a first prism that deflects light from a first part and guides it to the first lens. The second optical unit has a second lens on the object side and a second prism that deflects light from a second part and guides it to the second lens. The first optical axis of the first optical unit from the object being measured to the first prism and the second optical axis of the second optical unit from the object being measured to the second prism are substantially parallel, and the distance between the first optical axis and the second optical axis is less than the distance between the center of the first lens and the center of the second lens.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: International Publication No. 2022 / 030292 Utility Model Content

[0010] Patent document 1 does not describe how to position and maintain the first prism and the second prism in an optimal location.

[0011] In addition, when the first prism and the second prism are arranged close together, there is a problem that the corners (edges) of the two prisms are in contact with each other at their acute angles, which makes the prisms prone to breakage.

[0012] The purpose of this invention is to provide an optical device that can reliably configure and hold the first prism and the second prism in close proximity, and can reduce the possibility of damage caused by contact between the two prisms.

[0013] The above objectives are achieved through the following means.

[0014] (1) An optical device, characterized in that it comprises:

[0015] The first photometer is used to receive light from the first part of the object being measured;

[0016] The first optical unit has a first lens for focusing light from the first part onto the object side of the first photometer, and a first prism for deflecting light from the first part and guiding it to the first lens;

[0017] The second photometric unit is used to receive light from the second part of the object being measured;

[0018] The second optical unit includes a second lens for focusing light from the second portion onto the object side of the second photometer, and a second prism for deflecting light from the second portion and guiding it to the second lens; and

[0019] A prism holder secures the first prism and the second prism.

[0020] The first optical axis of the first optical unit from the object being measured to the first prism and the second optical axis of the second optical unit from the object being measured to the second prism are substantially parallel, wherein,

[0021] The first prism has a first plane on the side of the second prism that is substantially parallel to the first optical axis.

[0022] The second prism has a second plane that is substantially parallel to the second optical axis on the side of the first prism.

[0023] With the first and second planes positioned such that the distance between them is defined by abutting against the spacing defining member, the first and second prisms are fixed to the prism holder.

[0024] (2) In the optical device described in item 1 above, the length of the first optical axis of the first plane and the length of the second optical axis of the second plane are respectively set to 0.5 to 5.0 mm.

[0025] (3) In the optical device described in item 1 or 2 above, the spacing specification component is integrally provided with the prism holder.

[0026] (4) In the optical device described in item 1 or 2 above, the spacing specification component is formed separately from the prism holder and is removed when the first prism and the second prism are fixed to the prism holder.

[0027] (5) In the optical device described in item 1 or 2 above, the prism is made of glass material.

[0028] (6) In the optical device described in item 1 or 2 above, the prism holder is made of a metallic material.

[0029] (7) In the optical device described in item 1 or 2 above, the first prism and the second prism are fixed to the prism holder by means of a prism pressing member.

[0030] (8) In the optical device described in item 7 above, the prism holder has a first abutment portion located between the first and second prisms and the first and second lenses, perpendicular to the direction of the first and second optical axes, and has a second abutment portion extending parallel to the first and second optical axes from the side of the first face facing the first and second prisms.

[0031] The first and second prisms are fixed to the prism holder when they are pressed against the first and second abutting parts by the pressure of the prism pressing member.

[0032] (9) In the optical device described in item 8 above, the prism pressing component applies pressure to the inclined surfaces of the first and second prisms.

[0033] (10) In the optical device described in item 1 or 2 above, a first lens barrel for fixing the first lens and a second lens barrel for fixing the second lens are provided.

[0034] The first and second lens barrels are held in place by a lens barrel holder.

[0035] (11) In the optical device described in paragraph 1 or 2 above, the prism holder is positioned and fixed to the lens holder.

[0036] (12) In the optical device described in item 1 or 2 above, both the first lens tube and the second lens tube are approximately cylindrical in shape.

[0037] The lens barrel is held in place by two holding portions near the end of the generally cylindrical shape.

[0038] (13) In the optical device described in item 1 or 2 above, the holding portions of the two parts are fitting holes that respectively fit into the first lens barrel and the second lens barrel.

[0039] Compared to the engagement of the retaining portion on one side near the prism, the gap between the engagement hole and the first and second mirror tubes is smaller.

[0040] (14) In the optical device described in item 10 above, the lens holder is made of a metallic material.

[0041] (15) In the optical device described in paragraph 10 above, the first lens barrel and the second lens barrel are held substantially parallel to the lens barrel holder.

[0042] (16) In the optical device described in paragraph 10 above, the first lens barrel and the second lens barrel are positioned and fixed to the lens barrel holder.

[0043] The optical device also includes a prism cover that covers the first prism and the second prism.

[0044] The prism cover is provided with a first opening and a second opening, which allow light effective for measurement from the object being measured to pass through the first prism and the second prism, respectively.

[0045] The portion of the first opening closest to the first plane is located on the side away from the first plane, and the portion of the second opening closest to the second plane is located on the side away from the second plane.

[0046] According to the optical device of this invention, the first prism has a first plane that is substantially parallel to the first optical axis on the second prism side, and the second prism has a second plane that is substantially parallel to the second optical axis on the first prism side. Furthermore, the first and second prisms are fixed to a prism holder with the first and second planes positioned such that the distance between them is defined by abutting against a spacing defining member. Therefore, by pre-setting the thickness of the spacing defining member to an appropriate distance between the first and second prisms, the first and second prisms can be positioned close together in an optimal location. Additionally, by fixing the first and second prisms to the prism holder in this state, the first and second prisms can be reliably held in their optimal positions.

[0047] Furthermore, the opposing portions of the first and second prisms, which are positioned close together, are formed as planes parallel to the first and second optical axes, respectively. Therefore, during assembly and other processes, compared to cases where the opposing portions are at acute angles, contact between the prisms can be avoided, reducing the possibility of prism breakage. As a result, the first and second prisms can be brought closer together, enabling the measurement of two adjacent portions on the object being measured. Additionally, when contacting the spacing specification member, compared to cases where the opposing portions are at acute angles, the possibility of prism breakage and accuracy degradation due to denting of the spacing specification member is reduced. Attached Figure Description

[0048] Figure 1 This is a front view of a colorimeter equipped with an optical device according to one embodiment of the present invention.

[0049] Figure 2 This is an exploded stereoscopic view of the main components of a colorimeter.

[0050] Figure 3 This is a three-dimensional view of the prism holder before it is set up, viewed from below.

[0051] Figure 4 This is a perspective view of the prism holder after the prism has been set up, viewed from below.

[0052] Figure 5 This is a bottom view of the prism holder after the prism is installed.

[0053] Figure 6 It is Figure 5 A cross-sectional view and a partially enlarged view of the prism holder when cut with 6A-6A wire.

[0054] Figure 7 It is Figure 5 A three-dimensional view of the prism holder cut with 6A-6A line.

[0055] Figure 8 This is a three-dimensional view of a prism holder that uses prism pressing components to fix the state of each prism.

[0056] Figure 9 This is a 3D view of the color luminance meter before the prism cover is installed.

[0057] Figure 10 This is a 3D view of the color luminance meter after the prism cover has been installed.

[0058] Figure 11 This is a diagram used to illustrate the positional relationship between the first and second openings of the prism cover and the first and second planes of the prism.

[0059] Figure 12 This is a longitudinal cross-sectional view of the colorimeter with the prism cover removed.

[0060] Figure 13A as well as Figure 13B This is an explanatory diagram illustrating the assembly method of a colorimeter equipped with an optical device according to other embodiments of this utility model. Detailed Implementation

[0061] The embodiments of this utility model are described below with reference to the accompanying drawings.

[0062] Figure 1 This is a front view of a colorimeter 100 equipped with an optical device according to one embodiment of the present invention. Figure 2 This is an exploded stereoscopic view of the main components of the color luminance meter 100.

[0063] The color luminance meter 100 includes a first detector 10A and a second detector 10B arranged in a parallel configuration. In this embodiment, the orientation of the color luminance meter 100 is not limited; for example, the first detector 10A and the second detector 10B are arranged vertically. In this specification, [the following will be used]... Figure 1 In the front view shown, the up and down direction is called the up and down direction, the left and right direction is called the left and right direction, the thickness direction of the paper is called the front and back direction, the thickness direction and the front side are called the front, and the depth side is called the back.

[0064] The first detector 10A includes a rectangular first photometer 11A and a cylindrical first lens tube 12A integrally formed with the first photometer 11A and extending downward from the lower end of the first photometer 11A. The first photometer 11A contains a receiver for receiving light from the object being measured 1 (…). Figure 12 The first sensor 13A (as shown) converts light from its first part 1A into light through photoelectric conversion and outputs an electrical signal (analog signal) with an intensity corresponding to the intensity of the light. Figure 12 (As shown). Furthermore, it includes a calculation unit (not shown) that processes the electrical signals from the first sensor 13A to calculate the measured values. The first sensor 13A can be one or more; in this embodiment, there are three first sensors 13A.

[0065] The structure of the second detector 10B is the same as that of the first detector 10A. That is, the second detector 10B includes a rectangular second photometric section 11B and a cylindrical second lens tube 12B integrally formed with the second photometric section 11B and extending downward from the lower end of the second photometric section 11B. The second photometric section 11B contains a second portion 1B that receives signals from the object being measured 1. Figure 12 The second sensor 13B (as shown) performs photoelectric conversion on the light and outputs an electrical signal with an intensity corresponding to the intensity of the light. Figure 12(As shown). Furthermore, it includes a calculation unit (not shown) that processes the electrical signals from the second sensor 13B to calculate the measured values. The second sensor 13B can be one or more; in this embodiment, there are three second sensors 13B.

[0066] The first lens 14A is provided in the first lens tube 12A of the first detector 10A (e.g. Figure 12 (As shown). The first lens 14A is the lens on the object side, and is used to focus the light from the first part 1A of the object being measured 1 onto the first photometric part 11A. The light beam transmitted through the first lens 14A is split into three beams in the optical waveguide (not shown) and guided to each of the three first sensors 13A.

[0067] The structure of the second lens tube 12B of the second detector 10B is the same as that of the first lens tube 12A of the first detector 10A. That is, the second lens tube 12B of the second detector 10B includes a second lens 14B (e.g., Figure 12 (As shown). The second lens 14B is the lens on the object side, used to focus the light from the second part 1B of the object being measured 1 onto the second photometric part 11B. The light beam transmitted through the second lens 14B is split into three beams in an optical waveguide (not shown) and guided to each of the three second sensors 13B. In addition, one or more lenses may also be provided on the sensor side of the first lens 14A and the second lens 14B.

[0068] like Figure 1 as well as Figure 2 As shown, the first detector 10A and the second detector 10B are fixed and held by a lens holder 20, as described below. In addition, a prism holder 30 is fixed to the lower part of the lens holder 20, and a prism cover 40 covering the prism holder 30 from the bottom is fixed to the lens holder 20.

[0069] The lens barrel retainer 20 includes two horizontally separated plates 21 and 22, a vertical plate 23 connecting the rear end faces of each horizontal plate 21 and 22, and a width-direction plate connecting each horizontal plate 21 and 22. Figure 1 The support plate 24 is located in the center of the left-right direction. The lens barrel holder 20 is integrally formed from a metal material such as aluminum.

[0070] In the upper horizontal plate portion 21 of the lens holder 20, one upper fitting hole 211 and 212 are formed on each side of the support plate portion 24, totaling two. In the lower horizontal plate portion 22, two lower fitting holes 221 and 222 are also formed coaxially with each of the upper fitting holes 211 and 212. Furthermore, the first lens 12A of the first detector 10A is fitted into each of one of the upper fitting holes 211 and one of the lower fitting holes 221, and the second lens 12B of the second detector 10B is fitted into each of the other upper fitting hole 212 and the other lower fitting hole 222.

[0071] At the lower ends of the photometer sections 11A and 11B of the first detector 10A and the second detector 10B, respectively, flanges 15A and 15B protruding in the front-to-back horizontal direction are formed. With the first lens barrel 12A and the second lens barrel 12B fitted into the upper fitting holes 211 and 221 and the lower fitting holes 212 and 222, the lower surfaces of the flanges 15A and 15B abut against the upper horizontal plate portion 21 of the lens barrel holder 20. In this state, each flange 15A and 15B and the upper horizontal plate portion 21 are fixed by screws 16. Thus, the first detector 10A and the second detector 10B are fixedly held to one lens barrel holder 20 in a substantially parallel state. By making the first detector 10A and the second detector 10B substantially parallel, the object 1 can be measured from the same angle, thus reducing the influence of the light distribution characteristics of the object 1.

[0072] In this embodiment, the inner diameters of the lower fitting holes 221 and 222 are set to be smaller than the inner diameters of the upper fitting holes 211 and 212. Therefore, the first lens barrel 12A and the second lens barrel 12B are more securely fitted in the lower fitting holes 221 and 222. The reason for this more secure fitting of the first lens barrel 12A and the second lens barrel 12B in the lower fitting holes 221 and 222 is as follows.

[0073] That is, the reason is that by securely fitting the prism holder 30 into the lower fitting holes 221, 222 near the prism holder 30, the relative positional accuracy of the prism holder 30 and even the relative positional accuracy of the prisms 50A, 50B can be improved.

[0074] In this embodiment, as described above, the two lens barrels 12A and 12B are held by a single lens barrel holder 20. Therefore, compared to the case where two lens barrels 12A and 12B are held by two or more parts, the accuracy of the positional relationship between the first detector 10A and the second detector 10B can be improved. Furthermore, compared to the case where two lens barrels 12A and 12B are held by two or more parts, the strength is increased due to the absence of a connecting part. Therefore, even when subjected to impact, the accuracy of the positional relationship between the first detector 10A and the second detector 10B can be ensured.

[0075] In this embodiment, by fitting the first lens barrel 12A and the second lens barrel 12B into two locations at the upper and lower horizontal plate portions 21 and 22, the span between the portions determining the posture of each lens barrel 12A and 12B becomes longer. This also improves the accuracy of the positional relationship between the first detector 10A and the second detector 10B. Compared to the case where they are fitted into only one location, the torque on each lens barrel 12A and 12B generated during impacts such as falling is reduced, and the deformation of each lens barrel 12A and 12B is suppressed, thereby ensuring the accuracy of the positional relationship between the first detector 10A and the second detector 10B.

[0076] While the example shown uses a metal material for the lens barrel retainer 20, it could also be made of resin. However, when improved resistance to impacts such as drops is desired, a metal material is preferred. Even when ensuring positional accuracy in response to changes in ambient temperature is desired, a metal material with a low coefficient of linear expansion is preferable.

[0077] Regarding the lens barrel retainer 20 used in this embodiment, since its metal processing can be performed using a single chuck (or mold processing in the case that the lens barrel retainer 20 is made of resin), precision can be improved at a low cost.

[0078] The prism holder 30 is a one-piece molded product made of metal materials such as aluminum. For example... Figure 2 as well as Figure 3 As shown, the prism holder 30 includes a horizontal substrate 31, a horizontal portion 321 extending downward in the width direction (left-right direction) along the front edge of the back surface (lower surface) of the substrate 31, and a vertical portion 322 extending forward and backward and protruding downward in a manner that separates the substrate 31 from the left and right. On both sides of the vertical portion 322 in the left-right direction, a concave first prism receiving portion 33A and a second prism receiving portion 33B are formed, respectively surrounded by the vertical portion 322 and the horizontal portion 321.

[0079] The first prism 50A is housed in the first prism housing section 33A. The second prism 50B is housed in the second prism housing section 33B. Furthermore, the upper surfaces (back surfaces of the substrate 31) of the first and second prism housing sections 33A and 33B become first contact sections 34A and 34B that abut against the ejection surfaces of the upper surfaces of each prism 50A and 50B. Additionally, the inner surface of the horizontal section 321 is a vertical surface perpendicular to the substrate 31, and this vertical surface becomes a second contact section 35A and 35B that abut against each prism 50A and 50B.

[0080] On the substrate 31 of the prism holder 30, a first circular hole 36A and a second circular hole 36B are formed in the first prism receiving portion 33A and the second prism receiving portion 33B, respectively, penetrating the substrate 31. The first circular hole 36A serves to guide the measurement light incident from the object to be measured 1 onto the first prism 50A and reflected from the inner surface of the first prism 50A to the first lens 14A when the first prism 50A is received in the first prism receiving portion 33A. The second circular hole 36B serves to guide the measurement light incident from the object to be measured 1 onto the second prism 50B and reflected from the inner surface of the second prism 50B to the second lens 14B when the second prism 50B is received in the second prism receiving portion 33B.

[0081] A spacing defining member 37, protruding downward and extending in the front-rear direction, is integrally formed with the longitudinal portion 322. The front-rear length of the spacing defining member 37 is set to be greater than the front-rear lengths of the first prism 50A and the second prism 50B. This spacing defining member 37 defines the spacing between the first prism 50A and the second prism 50B, which are housed in the first prism housing portion 33A and the second prism housing portion 33B. In addition, each side of the spacing defining member 37 in the thickness direction is perpendicular to the substrate 31, and these surfaces become the third abutment portions 38A and 38B.

[0082] That is, the opposing portions of the first prism 50A and the second prism 50B, which are respectively housed in the first and second prism housing portions 33A and 33B, abut against the third abutting portions 38A and 38B on both sides of the spacing determination member 37 in the thickness direction. As a result, the spacing between the first prism 50A and the second prism 50B is set to be the same as the thickness of the spacing determination member 37.

[0083] Prism 50A and prism 50B are both parallelogram prisms made of transparent glass. They perform two total internal reflections on the light from the object being measured 1 and guide it to the corresponding lenses 14A and 14B. Prism 50A and lens 14A constitute the first optical unit 60A (e.g., ...). Figure 12 As shown), the second optical unit 60B is composed of the second prism 50B and the second lens 14B (as shown). Figure 12 (As shown).

[0084] In this embodiment, the opposing portions of the first prism 50A and the second prism 50B, separated by a spacing specified by component 37, are as follows: Figure 3 As shown, the first plane 51A and the second plane 51B are parallel. Specifically, the first plane 51A is perpendicular to the bottom surface of the first prism 50A and stands vertically upwards, and the second plane 50B is perpendicular to the bottom surface of the second prism 50B and stands vertically upwards.

[0085] The reason for making the opposing portions of the first prism 50A and the second prism 50B parallel to each other, namely the first plane 51A and the second plane 51B, is as follows. That is, during assembly processes, compared to cases where the opposing portions are sharp-angled corners (i.e., edge shapes), it is possible to avoid contact between the planes of each prism 50A and 50B, thus reducing the possibility of breakage of prisms 50A and 50B. This is because, as a result, the first prism 50A and the second prism 50B can be brought closer together, allowing measurement of two adjacent portions 1A and 1B on the object being measured 1. In particular, when each prism 50A and 50B is made of easily breakable glass, the effect of preventing breakage is greater. Furthermore, as with cases where the opposing portions are edge shapes, when the opposing portions abut against the spacing guide member 37, there will be no deterioration in the accuracy of the prism position due to the recess of the spacing guide member 37.

[0086] To effectively achieve this effect, although there are no limitations, such as Figure 6 As shown, the vertical length (length in the first optical axis direction, as described later) LA of the first plane 51A is preferably set to 0.5 to 5.0 mm. Similarly, the vertical length (length in the second optical axis direction, as described later) LB of the second plane 51B is preferably set to 0.5 to 5.0 mm.

[0087] Figure 4 as well as Figure 5 This diagram shows the state in which the first and second prisms 50A and 50B are housed in the first and second prism housing sections 33A and 33B, respectively. Each prism 50A and 50B is housed in the first and second prism housing sections 33A and 33B as described below.

[0088] First, the first prism 50A is positioned so that its first plane 51A faces the second plane 51B of the second prism 50B, and its upper surface ejection surface abuts against the first abutment portion 34A of the prism holder 30. In this state, the first prism 50A is pressed in towards the second abutment portion 35A, so that the front surface of the first prism 50A abuts against the second abutment portion 35A. While maintaining this state, the first prism 50A is pressed in towards the third abutment portion 38A of one side of the spaced-apart member 37, so that the first plane 51A of the first prism 50A abuts against the third abutment portion 38A.

[0089] Similarly, the second prism 50B is positioned such that its second plane 51B faces the first plane 51A of the first prism 50A, and its upper surface ejection surface abuts against the first abutment portion 34B of the prism holder 30. In this state, the second prism 50B is pressed in towards the second abutment portion 35B, so that the front surface of the second prism 50B abuts against the second abutment portion 35B. While maintaining this state, the second prism 50B is pressed in towards the third abutment portion 38B of one side of the spaced-apart member 37, so that the second plane 51B of the second prism 50B abuts against the third abutment portion 38B.

[0090] Furthermore, each prism 50A and 50B is installed on the prism holder 30 before the prism holder 30 is fixed to the lens barrel holder 20, so the prism holder 30 can be in any position to install each prism 50A and 50B.

[0091] Thus, with each prism 51A and 51B positioned appropriately, such as Figure 6 as well as Figure 7 As shown, the first plane 51A and the second plane 51B of each prism 51A and 51B are close to each other in a parallel state, sandwiching the thickness of the spaced component 37.

[0092] Each prism 50A, 50B is positioned appropriately in the prism holder as follows: Figure 8 As shown, the first prism pressing member 70A and the second prism pressing member 70B are used to fix it to the prism holder 30.

[0093] The first and second prism pressing components 70A and 70B are both composed of leaf springs bent at obtuse angles. With the first prism 50A and the second prism 50B subjected to pressure applied to the prism holder 30 by the force exerted by each leaf spring, the first and second prism pressing components 70A and 70B are fixed to the prism holder 30 using screws 71. With the first and second prism pressing components 70A and 70B fixed, the first and second prisms 50A and 50B are pressed against the prism holder 30 and fixed, respectively.

[0094] The abutting portion of the first prism 50A, which applies pressure by contacting the first prism pressing member 70A, is formed as an inclined surface 52A, where the corner between the light-incident surface of the lower surface of the first prism 50A and the rear surface of the first prism 50A connected to the light-incident surface is chamfered. Furthermore, in this embodiment, the corner between the light-incident surface of the lower surface of the first prism 50A and the front surface of the first prism 50A connected to the light-incident surface is also chamfered to form an inclined surface. Similarly, for the second prism 50B, the abutting portion of the second prism 50B, which applies pressure by contacting the second prism pressing member 70B, is formed as an inclined surface 52B, where the corner between the light-incident surface of the lower surface of the second prism 50B and the rear surface of the second prism 50B connected to the light-incident surface is chamfered. Furthermore, in this embodiment, the corner between the light incident surface of the lower surface of the second prism 50B and the front surface of the second prism 50B connected to the light incident surface is also chamfered to form an inclined surface.

[0095] In this way, the first and second prism pressing members 70A and 70B apply pressure to the inclined surfaces 52A and 52B of the first and second prisms 50A and 50B, respectively, so that the pressure applied by the first and second prism pressing members 70A and 70B can be borne by a flat surface. Through this pressure, each prism 50A and 50B is pressed into the direction of the first abutment portion 34A and 34B and the direction of the second abutment portion 35A and 35B, respectively, and each prism 50A and 50B is reliably fixed to the prism holder 30.

[0096] Alternatively, the first prism 50A and the second prism 50B can be attached to the prism holder 30 not by the first prism pressing member 70A and the second prism pressing member 70B, but by adhesive. Or, the first prism pressing member 70A and the second prism pressing member 70B can be attached to the prism holder 30 by adhesive.

[0097] As described above, in this embodiment, the prism holder 30 is made of metal, but it could also be made of resin. However, when it is desirable to bring the first prism 50A and the second prism 50B closer together, it is preferable to make it of metal, which reduces the thickness of the spacing specification member 37. Furthermore, by making it of metal, the risk of breakage of the first and second prisms 50A and 50B increases when they abut against the third contact portions 38A and 38B of the spacing specification member 37. Therefore, the breakage prevention effect obtained by setting the opposing portions of the first and second prisms 50A and 50B as the first plane 51A and the second plane 51B is more effectively achieved when it is made of metal.

[0098] The prism holder 30 holds the first and second prisms 50A and 50B within the first and second prism receiving portions 33A and 33B, respectively. Figure 9As shown, in the positioned state, it is fixed to the lower horizontal plate portion 22 of the lens barrel retainer 20 by screws 39.

[0099] The prism holder 30 has an upper surface 300 on the upper surface of the substrate 31 that is parallel to the first abutment portions 34A and 34B (e.g., Figure 6 as well as Figure 9 (As shown). When fixed to the lens holder 20, the upper surface 300 of the prism holder 30 abuts against the lower surface of the lower horizontal plate portion 22 of the lens holder 20.

[0100] Furthermore, with the prism holder 30 fixed to the lens holder 20, the position of the first circular hole 36A on the substrate 31 of the prism holder 30 coincides with the lower end opening of the first lens barrel 12A of the first detector 10A. Similarly, the position of the second circular hole 36B coincides with the lower end opening of the second lens barrel 12B of the second detector 10B.

[0101] The prism cover 40, which covers the prism retainer 30 from below, is as follows: Figure 9 as well as Figure 10 As shown, in its positioned state, it is fixed to the lens holder 20 by screw 41. In the prism cover 40, a first opening 43A and a second opening 43B, each composed of circular holes of different sizes, are formed near the center of the planar base plate 42. The prism cover 40 has no openings other than the first opening 43A and the second opening 43B, thus blocking unwanted light.

[0102] The first opening 43A and the second opening 43B respectively allow measurement light from the first part 1A and the second part 1B of the object being measured 1 to be transmitted and incident on the first prism 50A and the second prism 50B. The sizes of the first opening 43A and the second opening 43B are set to be a certain amount larger than the measurement area. Therefore, the operator can determine the approximate measurement location of the object being measured 1.

[0103] Furthermore, such as Figure 11 As shown, the end edge 44A of the first opening 43A, near the first plane 51A of the first prism 50A, is located on the side away from the first plane 51A at position R1. Similarly, the end edge 44B of the second opening 43B, near the second plane 51B of the second prism 50B, is located on the side away from the second plane 51B at position R2.

[0104] In this embodiment, by providing the prism cover 40, the operator can determine the approximate measurement position of the optical axis direction (up and down direction in this embodiment) based on the position of the surface of the prism cover 40 on the side of the object to be measured 1.

[0105] Next, the assembly method of the color luminance meter 100 will be explained.

[0106] First, the first lens barrel 12A of the first detector 10A and the second lens barrel 12B of the second detector 10B are fitted from top to bottom into the fitting holes 211 and 212 of the upper horizontal plate portion 21 of the lens barrel holder 20. Next, the first lens barrel 12A and the second lens barrel 12B are fitted into the fitting holes 221 and 222 of the lower horizontal plate portion 22. In this embodiment, the first lens barrel 12A and the second lens barrel 12B are more securely fitted into the lower fitting holes 221 and 222 of the prism holder 30 than into the upper fitting holes 211 and 212. Therefore, the relative positional accuracy of the prism holder 30 and even the relative positional accuracy of the first and second prisms 50A and 50B can be improved.

[0107] In this state, the flanges 15A and 15B of the first lens barrel 12A and the second lens barrel 12B are fixed to the lens barrel retainer 20 by screws.

[0108] Next, the prisms 50A and 50B are installed into the prism receiving portions 33A and 33B using the prism holder 30. Specifically, the upper surface ejection surfaces of the first and second prisms 50A and 50B are brought into contact with the first contact portions 34A and 34B of the prism receiving portions 33A and 33B. Then, the prisms 50A and 50B are pressed into contact with the second contact portions 35A and 35B, so that the front surfaces of the prisms 50A and 50B are brought into contact with the second contact portions 35A and 35B.

[0109] Then, each prism 50A and 50B is pressed in towards the same direction, so that the first plane 51A and the second plane 51B abut against the third abutting portions 38A and 38B on both sides of the thickness direction of the spaced specified component 37, thereby positioning each prism.

[0110] The opposing portions of the first prism 50A and the second prism 50B are formed as planar shapes such as the first plane 51A and the second plane 51B. Therefore, compared to the case where the opposing portions are acute angles, the possibility of corner breakage when they come into contact with the third contact portions 38A and 38B can be reduced. In addition, not only when they come into contact with the third contact portions 38A and 38B, but also during the handling of each prism 50A and 50B, the possibility of breakage due to contact with other components can be reduced.

[0111] After positioning the prisms 50A and 50B against the first abutment portions 34A and 34B, the second abutment portions 35A and 35B, and the third abutment portions 38A and 38B, the first prism pressing member 70A and the second prism pressing member 70B are fixed to the prism holder 30 by screws. With the screws tightened, the first prism pressing member 70A and the second prism pressing member 70B press against the inclined surfaces 52A and 52B of each prism 50A and 50B by their elastic force. Furthermore, each prism 50A and 50B is pressed in each direction toward the first abutment portions 34A and 34B and the second abutment portions 35A and 35B. Using these first and second prism pressing members 70A and 70B, the first and second prisms 50A and 50B are fixedly held in the appropriate position.

[0112] After installing the first and second prisms 50A and 50B into the prism holder 30, the prism holder 30 is secured to the lens barrel holder 20 with screws. Next, the prism cover 40 is secured to the lens barrel holder 20 by screws covering the prism holder 30, thus completing the assembly of the color luminance meter 100.

[0113] In use, the first and second detectors 10A and 10B are positioned vertically, and the lower surface of the prism cover 40 is close to the object being measured 1 and is in a horizontal orientation. However, the orientation when using the colorimeter 100 is not limited. If necessary, the lens holder 20 can also be fixed to a support device (not shown).

[0114] When performing measurements under these conditions, such as Figure 12 As shown, the light to be measured emitted from the first part 1A of the object being measured 1 is incident on the first prism 50A through the first opening 43A of the prism cover 40 along the first optical axis AX1 of the first optical unit 60A. The light to be measured incident on the first prism 50A is polarized by the first prism 50A, and is emitted upward from the first prism 50A, passing through the first circular hole 36A of the prism holder 30 to reach the first lens 14A of the first lens barrel 12A. Moreover, after passing through the first lens 14A, it is received by the first sensor 13A of the first photometric unit 11A.

[0115] On the other hand, the light to be measured emitted from the second part 1B of the object being measured 1 is incident on the second prism 50B through the second opening 13B of the prism cover 40 along the second optical axis AX2 of the second optical unit 60B. The light to be measured incident on the second prism 50B is polarized by the second prism 50B and emitted upward from the second prism 50B, passing through the second circular hole 36B of the prism holder 30 to reach the second lens 14B of the second lens barrel 12B. Moreover, after passing through the second lens 14B, it is received by the second sensor 13B of the second photometer unit 11B.

[0116] In this embodiment, the first optical axis AX1 and the second optical axis AX2 are kept substantially parallel and as close as possible with high precision. This is because the orientations of the first and second prisms 50A and 50B are positioned with high precision. Specifically, as described above, each prism 50A and 50B is positioned and fixed by a prism holder 30, which is a single component. Since the prism holder 30 is a single component, the first contact portions 34A and 34B where the ejection surfaces of each prism 50A and 50B abut can be machined with high precision. By reliably abutting each prism 50A and 50B against the first contact portions 34A and 34B of the prism holder 30, the substantially parallel state of the first optical axis AX1 and the second optical axis AX2 can be ensured.

[0117] In addition, the prism holder 30 has an upper surface 300 on the upper surface of the substrate 31 that is parallel to the first abutment portions 34A and 34B. The upper surface 300 abuts against the lower surface of the lower horizontal plate portion 22 of the lens holder 20 and is positioned and fixed thereon, thereby ensuring the slope and position of the first optical axis AX1 and the second optical axis AX2.

[0118] Furthermore, the first and second prisms 50A and 50B reliably abut against the second abutment portions 35A and 35B of the prism holder 30. When fixed in a state where at least one prism 50A or 50B is unilaterally lifted (detached) relative to the second abutment portions 35A and 35B, the first optical axis AX1 and the second optical axis AX2 deviate from predetermined positions in the left-right and front-back directions. With each prism 50A and 50B reliably abutting against the first abutment portions 34A and 34B and the second abutment portions 35A and 35B of the prism holder 30, each prism 50A and 50B further reliably abuts against the third abutment portions 38A and 38B of the prism holder 30. Therefore, the spacing and parallelism of the first optical axis AX1 and the second optical axis AX2 are ensured.

[0119] The parallelism between the first plane 51A of the first prism 50A, the second plane 51B of the second prism 50B, and the surfaces of the third abutting portions 38A and 38B is effective at the following points. That is, when the first and second planes 51A and 51B of each prism 50A and 50B abut against the third abutting portions 38A and 38B, it is effective at points where each prism 50A and 50B is not far from the first abutting portions 34A and 34B. When the first and second planes 51A and 51B become inclined planes relative to the pressing direction (approaching direction), the first and second planes 51A and 51B rise above the third abutting portions 38A and 38B. In this case, each prism 50A and 50B moves away from the first abutting portions 34A and 34B, resulting in a deterioration in accuracy.

[0120] Furthermore, with the first and second planes 51A and 51B perpendicular to the lower surfaces (incident surfaces) of prisms 50A and 50B, prism manufacturing becomes easier, and the shape accuracy of prisms 50A and 50B can be expected to be improved at a low cost. Even more importantly, the spacing accuracy of the first optical axis AX1 and the second optical axis AX2 can be improved, allowing for accurate setting of the spacing between the two measured locations.

[0121] In the embodiments described above, the first plane 51A of the first prism 50A and the second plane 51B of the second prism 50B are brought into contact with the third contact portions 38A and 38B of the spacing defining member 37 of the prism holder 30, and the first plane 51A and the second plane 51B are arranged close together in a parallel state. The spacing defining member 37 is integrally provided with the prism holder 30, so after the colorimeter 100 is assembled, the spacing defining member 37 also exists as before.

[0122] However, after setting the interval between the first plane 51A and the second plane 51B in a parallel state and fixing each prism 50A, 50B, the interval specification component 37 may not be present.

[0123] Figure 13A as well as Figure 13B This is an explanatory diagram illustrating the assembly of the color luminance meter 100 without using the spacing specification component 37 integrated with the prism holder 30.

[0124] exist Figure 13A In the image, symbol 80 refers to an assembly fixture having a spacing defining member 81. This fixture 80 has a horizontal plate-shaped base 82 and multiple upward-pointing feet 83 on the upper surface of the base 82. Furthermore, a spacing defining member 81, protruding upward in the vertical direction and extending in the front-rear direction, is integrally formed with the base 82 approximately at its center in the left-right direction. The thickness of the spacing defining member 81 is ultimately set to the spacing between the first plane 51A of the opposing first prism 50A and the second plane 51B of the opposing second prism 50B.

[0125] Using the clamp 80, the first prism 50A and the second prism 50B are mounted to the prism holder 30. No spaced-out members 37 are formed on the lower surface of the prism holder 30.

[0126] First, the front end of the foot 83 is brought into contact with the lower surface of the prism holder 30, making the base plate 31 of the prism holder 30 and the base 82 of the clamp 80 parallel. The clamp 80 is positioned such that the position of the spacer 81 is such that it is positioned in the space formed between the first plane 51A of the first prism 50A and the second plane 51B of the second prism 50B. In this state, the clamp 80 is fixed, and the first prism 50A is received in the first prism receiving portion 33A of the prism holder 30 in a predetermined posture, and the second prism 50B is received in the second prism receiving portion 33B in a predetermined posture.

[0127] Next, the first and second prisms 50A and 50B are pressed into the first abutment portions 34A and 34B of the prism holder 30, respectively, so that the upper surfaces of each prism 50A and 50B abut against the first abutment portions 34A and 34B. Then, each prism 50A and 50B is also pressed into the second abutment portions 35A and 35B, so that the rear surfaces of each prism 50A and 50B abut against the second abutment portions 35A and 35B.

[0128] Then, each prism 50A and 50B is pressed in towards the same direction, so that the first plane 51A and the second plane 51B respectively abut against the third abutting portions 84A and 84B on both sides of the thickness direction of the spaced specified component 81, thereby positioning each prism 50A and 50B.

[0129] After positioning the prisms 50A and 50B against the first abutment portions 34A and 34B, the second abutment portions 35A and 35B, and the third abutment portions 84A and 84B, the first prism pressing member 70A and the second prism pressing member 70B are fixed to the prism holder 30 by screws. With the screws tightened, the first and second prism pressing members 70A and 70B, through their elastic force, press against the inclined surfaces 52A and 52B, which serve as the pressing surfaces of the first and second prisms 50A and 50B. This applies pressure to the first and second prisms 50A and 50B in each direction relative to the first abutment portions 34A and 34B and the second abutment portions 35A and 35B. Using the first prism pressing component 70A and the second prism pressing component 70B, the first and second prisms 50A and 50B are fixed and held in appropriate positions.

[0130] After installing the first and second prisms 50A and 50B into the prism holder 30, as follows: Figure 13B The clamp 80 is removed as shown. Even after the clamp 80 is removed, the first plane 51A of the first prism 50A and the second plane 51B of the second prism 50B face each other at a distance equivalent to the thickness of the spacing specification member 81 of the clamp 80, and remain in this state.

[0131] Next, the prism holder 30 is fixed to the lens holder 20 by screws, thus completing the assembly of the color luminance meter 100.

[0132] By using a clamp 80 with a spacing defining component 81 that ensures the position and orientation of the prism holder 30, the first and second prisms 50A and 50B are mounted to the prism holder 30. Therefore, the spacing defining component 81 does not need to be integrally formed in the prism holder 30. As a result, the structure of the prism holder 30 is simplified.

[0133] The above describes the embodiments of this utility model, but the utility model is not limited to the above embodiments. For example, the prism holder 30 and the lens barrel holder 20 can be constructed as separate parts, but they can also be integrated parts. However, it is preferable to make them separate parts. The reason is that the size of the parts to be handled when assembling the prism can be small, resulting in excellent assembly workability.

[0134] (Symbol Explanation)

[0135] 1: Measured object; 1A: First part; 1B: Second part; 100: Color luminance meter (optical device); 10A: First detector; 10B: Second detector; 11A: First metering section; 11B: Second metering section; 12A: First lens barrel; 12B: Second lens barrel; 13A: First sensor; 13B: Second sensor; 14A: First lens; 14B: Second lens; 20: Lens barrel holder; 21: Upper horizontal plate; 22: Lower horizontal plate; 23: Vertical plate; 24: Support plate; 211, 212: Upper fitting holes; 221, 222: Lower fitting holes; 30: Prism holder; 31: Substrate; 300: Upper surface of substrate; 321: Vertical part; 322: Horizontal part; 33A: First prism receiving part; 33 B: Second prism receiving part; 34A, 34B: First abutting part; 35A, 35B: Second abutting part; 36A, 36B: Circular hole; 37: Spacing defining component; 38A, 38B: Third abutting part; 40: Prism cover; 42: Base plate; 43A: First opening; 43B: Second opening; 44A: First end edge; 43B: Second end edge; 50A: First prism; 50B: Second prism; 51A: First plane; 51B: Second plane; 52A, 52B: Inclined surface; 60A: First optical unit; 60B: Second optical unit; 70A: First pressing component; 70B: Second pressing component; 80: Clamp; 81: Spacing defining component; 84A, 84B: Third abutting part; AX1: First optical axis; AX2: Second optical axis.

Claims

1. An optical device, characterized in that, have: The first photometer is used to receive light from the first part of the object being measured; The first optical unit has a first lens for focusing light from the first part onto the object side of the first photometer, and a first prism for deflecting light from the first part and guiding it to the first lens; The second photometric unit is used to receive light from the second part of the object being measured; The second optical unit has a second lens for focusing light from the second part onto the object side of the second photometer, and a second prism for deflecting light from the second part and guiding it to the second lens; as well as A prism holder secures the first prism and the second prism. The first optical axis of the first optical unit from the object being measured to the first prism and the second optical axis of the second optical unit from the object being measured to the second prism are substantially parallel, wherein, The first prism has a first plane on the side of the second prism that is substantially parallel to the first optical axis. The second prism has a second plane that is substantially parallel to the second optical axis on the side of the first prism. With the first and second planes positioned such that the distance between them is defined by abutting against the spacing defining member, the first and second prisms are fixed to the prism holder.

2. The optical device according to claim 1, characterized in that, The length of the first optical axis of the first plane and the length of the second optical axis of the second plane are respectively set to 0.5 to 5.0 mm.

3. The optical device according to claim 1 or 2, characterized in that, The spacing specification component is integrally provided with the prism holder.

4. The optical device according to claim 1 or 2, characterized in that, The spacing specification component is formed separately from the prism holder and is detached when the first prism and the second prism are fixed to the prism holder.

5. The optical device according to claim 1 or 2, characterized in that, The prism is made of glass.

6. The optical device according to claim 1 or 2, characterized in that, The prism holder is made of metal.

7. The optical device according to claim 1 or 2, characterized in that, The first prism and the second prism are fixed to the prism holder using the prism pressing component.

8. The optical device according to claim 7, characterized in that, The prism holder has a first abutment portion located between the first and second prisms and the first and second lenses, perpendicular to the directions of the first and second optical axes, and a second abutment portion extending parallel to the first and second optical axes from the side of the first face facing the first and second prisms. The first and second prisms are fixed to the prism holder when they are pressed against the first and second abutting parts by the pressure of the prism pressing member.

9. The optical device according to claim 8, characterized in that, The prism pressing component applies pressure to the inclined surfaces of the first and second prisms.

10. The optical device according to claim 1 or 2, characterized in that, It has a first lens barrel for fixing the first lens and a second lens barrel for fixing the second lens. The first and second lens barrels are held in place by a lens barrel holder.

11. The optical device according to claim 1 or 2, characterized in that, The prism retainer is positioned and fixed to the lens barrel retainer.

12. The optical device according to claim 1 or 2, characterized in that, Both the first and second lens tubes are approximately cylindrical in shape. The lens barrel is held in place by two holding portions near the end of the generally cylindrical shape.

13. The optical device according to claim 1 or 2, characterized in that, The retaining parts of the two locations are fitting holes that respectively fit into the first lens barrel and the second lens barrel. Compared to the engagement of the retaining portion on one side near the prism, the gap between the engagement hole and the first and second mirror tubes is smaller.

14. The optical device according to claim 10, characterized in that, The lens barrel holder is made of metal.

15. The optical device according to claim 10, characterized in that, The first lens barrel and the second lens barrel are held in generally parallel positions to the lens barrel holder.

16. The optical device according to claim 10, characterized in that, The first lens barrel and the second lens barrel are positioned and fixed to the lens barrel holder. The optical device also includes a prism cover that covers the first prism and the second prism. The prism cover is provided with a first opening and a second opening, which allow light effective for measurement from the object being measured to pass through the first prism and the second prism, respectively. The portion of the first opening closest to the first plane is located on the side away from the first plane, and the portion of the second opening closest to the second plane is located on the side away from the second plane.

Images