Detection mechanism and imaging device having the same

Abstract

To provide a detection mechanism with high reliability for detecting rotational position. [Solution] The detection mechanism comprises a rotating operating member that rotates around a rotation axis, a phase plate that rotates together with the rotating operating member and is arranged on a plurality of concentric circles around the rotation axis and has a plurality of reflective parts that reflect light and a non-reflective part that reflects less light than each of the plurality of reflective parts, a plurality of detection elements that are arranged on a plurality of concentric circles facing either of the plurality of reflective parts and non-reflective parts and output a signal corresponding to the intensity of light reflected by either of the plurality of reflective parts and non-reflective parts, and determination means for determining the rotation position of the rotating operating member according to the output of each of the plurality of detection elements, wherein each of the plurality of detection elements is arranged on a different straight line from a plurality of straight lines that pass through the rotation axis and extend radially perpendicular to the rotation axis.

Description

Technical Field

[0001] The present invention relates to a detection mechanism for detecting the rotational position of a rotary operation member.

Background Art

[0002] Conventionally, in an electronic device such as an imaging device, a detection mechanism for detecting the absolute rotational position of a rotary operation member for performing various settings is known. Patent Document 1 discloses a configuration in which a plurality of contact portions output a binary code by contacting signal patterns provided in a plurality of concentric circles centered on the rotation center of the rotary operation member in accordance with the rotation of the rotary operation member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration of Patent Document 1, since the contact portion contacts the signal pattern, conductive wear powder may occur. In this case, there is a concern that the conductive wear powder causes a short circuit in the signal pattern, resulting in a decrease in the contact reliability between the contact portion and the signal pattern and false detection.

[0005] An object of the present invention is to provide a detection mechanism with high reliability in detecting the rotational position.

Means for Solving the Problems

[0006] One aspect of the present invention is a detection mechanism comprising: a rotating operating member that rotates around a rotation axis; a phase plate that rotates together with the rotating operating member and is arranged on a plurality of concentric circles centered on the rotation axis, and has a plurality of reflective parts that reflect light and a non-reflective part that reflects less light than each of the plurality of reflective parts; a plurality of detection elements that are arranged on a plurality of concentric circles facing either of the plurality of reflective parts and non-reflective parts, and output a signal corresponding to the intensity of light reflected by either of the plurality of reflective parts and non-reflective parts; and a determination means for determining the rotation position of the rotating operating member according to the output of each of the plurality of detection elements, wherein each of the plurality of detection elements is arranged on a different straight line from a plurality of straight lines that pass through the rotation axis and extend radially perpendicular to the rotation axis. [Effects of the Invention]

[0007] According to the present invention, a detection mechanism with high reliability for detecting rotational position can be provided. [Brief explanation of the drawing]

[0008] [Figure 1] This is a block diagram of the camera in Example 1. [Figure 2] This is a perspective view of the camera in Example 1. [Figure 3] This is an exploded perspective view of the camera in Example 1. [Figure 4] This is a perspective view showing the internal structure of the top cover unit in Example 1. [Figure 5] This is an exploded perspective view of the top cover unit of Example 1. [Figure 6] This is a cross-sectional view of the top cover unit of Embodiment 1 at the center of the rotation axis of the dial. [Figure 7] This diagram shows the positional relationship between the phase plate and the detection element in Example 1. [Figure 8] This figure shows the signal output when the phase of the dial in Example 1 is at position 12. [Figure 9] This diagram shows the positional relationship between the phase plate and the detection element in Example 1. [Figure 10]This figure shows the positional relationship between the phase plate and the detection element in Example 2. [Figure 11] This figure shows the signal output when the dial phase of Example 2 is at position 8. [Figure 12] This is an explanatory diagram of the click mechanism and phase plate of Embodiment 3. [Figure 13] This is an explanatory diagram of the phase plate of Example 4. [Modes for carrying out the invention]

[0009] The embodiments of the present invention will be described in detail below with reference to the drawings. In each figure, the same reference numeral is used for identical components, and redundant explanations are omitted. [Examples]

[0010] Figure 1 is a block diagram of the camera (imaging device) 100 of this embodiment. Figure 2 is an external perspective view of the camera 100. Figures 2(a) and 2(b) are views of the camera 100 from the front and rear, respectively.

[0011] Camera 100 is a lens-interchangeable camera in which the lens unit 200 can be attached and detached. The lens unit 200 is fixed to camera 100 by a lens mount 201 provided on the lens unit 200 and a lens mount 101 provided on camera 100. The lens unit 200 and camera 100 are configured to communicate with each other via a lens-side connector 202 provided on the lens unit 200 and a camera-side connector 102 provided on camera 100. Specifically, the system control unit (determination means) 307 and the lens drive control unit 203 communicate, and based on the signal from the system control unit 307, the lens drive control unit 203 controls the lens drive unit 204, which drives the aperture 211 and the lens 210. The lens 210 guides light from the subject to the image sensor 302.

[0012] The shutter 301 consists of a focal plane shutter, is disposed between the imaging device 302 and the lens 210, and blocks the light from the lens 210 to the imaging device 302 in the non-photographing state. During photographing and during through-image display (live view display), the shutter blades 301a are opened under the control of the system control unit 307 to allow the light from the lens 210 to be guided to the imaging device 302. The imaging device 302 is composed of a CCD, a CMOS device, etc. that convert an optical image into an electrical signal and has an electronic shutter function.

[0013] The A / D converter 304 converts the analog signal output from the imaging device 302 into a digital signal.

[0014] The image processing unit 305 performs resize processing such as predetermined pixel interpolation and reduction, and color conversion processing on the data from the A / D converter 304 or the data from the memory control unit 306. Also, in the image processing unit 305, predetermined arithmetic processing is performed using the captured image data, and based on the obtained arithmetic result, the system control unit 307 performs exposure control and focus detection control. Thereby, TTL (through-the-lens) type AF (autofocus) processing, AE (automatic exposure) processing, EF (flash pre-emission) processing, and AWB (auto white balance) processing are performed.

[0015] The output data from the A / D converter 304 is written directly into the memory 308 via the image processing unit 305 and the memory control unit 306, or via the memory control unit 306. The memory 308 stores image data for displaying the image data converted into digital data by the A / D converter 304 on the display unit 105 or the finder display unit 106. Also, the memory 308 doubles as an image display memory (video memory). The D / A converter 309 converts the image display data stored in the memory 308 into an analog signal and supplies it to the display unit 105 or the finder display unit 106. Thus, the image data for display written into the memory 308 is displayed by the display unit 105 or the finder display unit 106 via the D / A converter 309. The display unit 105 and the finder display unit 106 perform display according to the analog signal from the D / A converter 309 on a display such as an LCD. Also, the display unit 105 has a touch panel function in which a capacitive or pressure-sensitive touch panel is built in, and various operations can be performed by the user touching it with a finger or the like. The digital signal that has been A / D converted once by the A / D converter 304 and stored in the memory 308 is analog-converted by the D / A converter 309 and sequentially transferred to the display unit 105 or the finder display unit 106 for display, thereby enabling through-image display.

[0016] The non-volatile memory 310 is an electrically erasable and recordable recording medium, and for example, an EEPROM or the like is used. Constant values, programs, etc. for the operation of the system control unit 307 are stored in the non-volatile memory 310.

[0017] The system control unit 307 is a control unit having at least one processor, and controls the entire camera 100 and the lens unit 200. A RAM is used for the system memory 311. Constant values, variables, programs read from the non-volatile memory 310, etc. for the operation of the system control unit 307 are expanded in the system memory 311. Also, the system control unit 307 performs display control by controlling the memory 308, the D / A converter 309, the display unit 105, the finder display unit 106, etc.

[0018] The system timer 312 measures the time used for various controls and the time of the built-in clock.

[0019] The first shutter switch 104a turns ON during the operation of the shutter button 104 on the camera 100, specifically when it is half-pressed (indicating preparation for shooting), generating the first shutter switch signal SW1. The first shutter switch signal SW1 initiates operations such as AF processing, AE processing, AWB processing, and EF processing.

[0020] The second shutter switch 104b turns ON when the shutter button 104 is fully pressed (shooting instruction), generating the second shutter switch signal SW2. The system control unit 307 controls the shutter blades 301a to drive based on the second shutter switch signal SW2, and starts a series of shooting processes from reading the signal from the image sensor 302 to writing the image data to the recording medium 330. The shutter blades 301a travel at high speed inside the shutter 301 in a direction perpendicular to the optical axis of the lens 210, and stop operating instantaneously by colliding with a stopper member (not shown) inside the shutter 301.

[0021] Each operating element of the control unit 108 is assigned a function as appropriate for each situation by selecting various function icons displayed on the display unit 105 or the viewfinder display unit 106, and functions as various function buttons. Examples of function buttons include an exit button, a back button, an image advance button, a jump button, a filter button, and an attribute change button. For example, when the menu button is pressed, various configurable menu screens are displayed on the display unit 105 or the viewfinder display unit 106.

[0022] The dial (rotational operating member) 109 is configured to lock and click at predetermined angular intervals in the circumferential direction, and the shooting mode of the camera 100 can be switched according to the locked phase (rotational position, angular phase).

[0023] The power to camera 100 is turned ON / OFF by the power switch 103.

[0024] The power control unit 313 consists of a battery detection circuit, a DC-DC converter, and a switch circuit for switching which blocks are energized, and detects whether a battery is installed, its type, and its remaining charge. The power control unit 313 also controls the DC-DC converter based on the detection results and instructions from the system control unit 307, supplying the necessary voltage to each part, including the recording medium 330, for the required period of time.

[0025] The power supply unit 314 consists of primary batteries such as alkaline batteries and lithium batteries, secondary batteries such as NiCd batteries, NiMH batteries and Li batteries, and an AC adapter. The recording medium I / F 315 is an interface with the recording medium 330, such as a memory card or hard disk. The recording medium 330 is a recording medium such as a memory card for recording captured images, and is composed of semiconductor memory, optical disks, magnetic disks, etc.

[0026] The communication unit 316 is connected wirelessly or via a wired cable and transmits and receives video signals, audio signals, etc. The communication unit 316 can also connect to a wireless LAN (Local Area Network) or the Internet. The communication unit 316 can transmit images captured by the image sensor 302 (including pass-through images) and images recorded on the recording medium 330, and can also receive image data and other various information from external devices.

[0027] The vibration detection unit 320 is composed of, for example, a gyro sensor and detects the amount of vibration of the camera 100. The vibration detection unit 320 detects the vibration and amount of vibration in the three axial directions of the camera 100: pitch, yaw, and roll.

[0028] The image sensor drive unit 303 controls the movement of the image sensor 302 according to the amount of shake detected by the shake detection unit 320 to perform optical shake correction. In addition, the image processing unit 305, under the control of the system control unit 307, electronically corrects the image shake according to the amount of shake detected by the shake detection unit 320.

[0029] Figure 3 is an exploded perspective view of the camera 100 with the front, rear, and bottom cover members removed. The base plate 120 is a structural element that provides strength to the camera 100, and the shutter 301, image sensor 302, image sensor drive unit 303, and system control unit 307 are fastened to it with screws (not shown). The top cover unit 110 is fastened to the base plate 120 with screws (not shown).

[0030] Figure 4 is a perspective view showing the internal structure of the top cover unit 110. The top cover unit 110 is constructed by assembling a power switch 103, a shutter button 104, and a dial 109, etc., to a top cover member 111, which serves as a housing covering the top surface of the camera 100, using screws (not shown) or the like. The top cover unit circuit board 115 has an electrical circuit formed therein for communicating various electrical signals such as the power switch 103, shutter button 104, and dial 109 with the system control unit 307, and is electrically connected to the system control unit 307 by a connection connector 116.

[0031] The configuration of the dial 109 and the detection mechanism for detecting the phase of the dial 109 will be described below. Figure 5 is an exploded perspective view showing the internal structure of the dial 109 of the top cover unit 110. Figures 5(a) and 5(b) are views from the internal and external sides, respectively. Figure 6 is a cross-sectional view of the top cover unit 110 at the center of the rotation axis of the dial 109 with various parts assembled. Figure 7 is a diagram showing the positional relationship between the phase plate 140 and the detection elements (first detection element 161, second detection element 162, third detection element 163, and fourth detection element 164).

[0032] The dial 109 is cylindrical in shape and has a shaft portion 109a as a rotation axis. The top cover member 111 is provided with a cylindrical insertion portion 125 for inserting the shaft portion 109a, and the dial 109 is mounted so as to be rotatable around the shaft portion 109a. A coil spring-shaped click spring (biasing member) 122 made of spring wire such as piano wire, and a spherical click ball (spherical member) 123 made of metal such as SUS are housed in a cylindrical storage portion 121 provided in the top cover member 111. The click member 130 is formed by resin injection molding, is positioned and fixed to the shaft portion 109a with fixing screws 124, and is configured to rotate coaxially in conjunction with the rotation of the dial 109. The click member 130 has a click groove (groove portion) 130a with an uneven shape formed at predetermined angular intervals along the circumferential direction. The click ball 123 is incorporated into a position corresponding to the irregularities of the click groove 130a, and the click spring 122 is incorporated in a compressed state. As a result, when the dial 109 is rotated, the click ball 123 falls into (engages with) the concave shape of the click groove 130a of the coaxially rotating click member 130, creating a lock and a click sensation at predetermined angular intervals. Furthermore, when the dial 109 is rotated, the shooting mode of the camera 100 can be switched according to the locked phase. At this time, it is desirable that the exterior of the dial 109 has letters or symbols indicating the shooting mode printed on it. It is also desirable that an indicator 126, such as a convex shape or printed on it, be provided at a position corresponding to the current shooting mode so that the shooting mode can be identified. This makes it easier for the user to identify the shooting mode, resulting in improved usability.

[0033] The phase plate 140 is formed from a sheet-like material of resin or metal and is attached to the side of the click member 130 opposite to the click groove 130a with double-sided tape (not shown) or the like, and is configured to rotate coaxially in conjunction with the rotation of the dial 109. The phase plate 140 is provided with multiple reflective parts that reflect light and multiple non-reflective parts that reflect less light than the multiple reflective parts, arranged in multiple concentric circles around the shaft portion 109a of the dial 109. In this embodiment, the multiple reflective parts consist of one first reflective part 141 provided on the concentric circle on the inner circumference (on the first concentric circle) and two second reflective parts 142 provided on the concentric circle on the outer circumference (on the second concentric circle). The first reflective part 141 and the second reflective parts 142 have an annular fan shape with a predetermined central angle and are provided in a double layer. The first reflective portion 141 and the second reflective portion 142 are surface-treated to reflect light, such as by aluminum vapor deposition. The non-reflective portion 143 is provided in the area of ​​the phase plate 140 other than the first reflective portion 141 and the second reflective portion 142, and is surface-treated to suppress light reflection, such as by black printing.

[0034] The retaining member 150 is formed by resin injection molding, holds the top cover unit substrate 115, and is fastened to the top cover member 111 with screws (not shown). The top cover unit substrate 115 includes a first detection element 161, a second detection element 162, a third detection element 163, and a fourth detection element 164, which are arranged in order along the rotation direction of the dial 109. The third detection element 163 and the fourth detection element 164 are surface-mounted by soldering at positions corresponding to the circumference of the first reflecting part 141 and facing each other at a certain distance apart. That is, the third detection element 163 and the fourth detection element 164 are arranged on concentric circles on the inner circumference side, facing either the first reflecting part 141 or the non-reflecting part. The third detection element 163 and the fourth detection element 164 output a signal corresponding to the intensity of light reflected by either the first reflecting part 141 or the non-reflecting part 143. Furthermore, the first detection element 161 and the second detection element 162 are surface-mounted by soldering at positions corresponding to the circumference of the second reflecting portion 142 and facing each other at a certain distance apart. That is, the first detection element 161 and the second detection element 162 are arranged on concentric circles on the outer circumference, facing either the second reflecting portion 142 or the non-reflecting portion. The first detection element 161 and the second detection element 162 output a signal corresponding to the intensity of light reflected by either the second reflecting portion 142 or the non-reflecting portion 143. Note that "facing" includes not only cases where they are strictly facing each other, but also cases where they are substantially facing each other (approximately facing each other).

[0035] The first detection element 161, the second detection element 162, the third detection element 163, and the fourth detection element 164 are non-contact detection sensors composed of electronic components such as photoreflectors. Light such as infrared light emitted from the first light-emitting part 161a of the first detection element 161, which consists of an LED or the like, is reflected by the detection object located in the first irradiation area 161c. The intensity of the light when it is received by the first light-receiving part 161b, which consists of a light-receiving element such as a phototransistor, is output as an electrical signal. The output value is transmitted to the system control unit 307 via the top cover unit substrate 115. At this time, the system control unit 307 outputs a "High=1" signal if the light intensity exceeds a predetermined threshold, and outputs a "Low=0" signal if it does not exceed the threshold. The second detection element 162, the third detection element 163, and the fourth detection element 164 have the same configuration as the first detection element 161. In this embodiment, an electronic component such as a photoreflector is used as the detection element, but it is not limited to this as long as it is a sensor capable of measuring the intensity of light reflection.

[0036] In Figure 7, the first detection element 161 is positioned opposite the second reflector 142 at a certain distance. Light emitted from the first light emitter 161a is reflected by the second reflector 142 and received by the first light receiver 161b. The system control unit 307 then outputs a "High=1" signal. The second detection element 162 is positioned opposite the non-reflector 143 at a certain distance. Light emitted from the second light emitter 162a is reflected by the non-reflector 143, but since the non-reflector 143 has a surface treatment that suppresses light reflection, the intensity of the light received by the second light receiver 162b does not exceed the threshold. The system control unit 307 then outputs a "Low=0" signal. The third detection element 163 is positioned opposite the non-reflector 143 at a certain distance. Light emitted from the third light-emitting section 163a is reflected by the non-reflective section 143. However, since the non-reflective section 143 has a surface treatment that suppresses light reflection, the intensity of the light received by the second light-receiving section 163b does not exceed the threshold. The system control unit 307 then outputs a "Low=0" signal. The fourth detection element 164 is located opposite the first reflecting section 141 at a certain distance. Light emitted from the fourth light-emitting section 164a is reflected by the first reflecting section 141 and received by the fourth light-receiving section 164b. The system control unit 307 then outputs a "High=1" signal.

[0037] As described above, the phase plate 140 rotates together with the dial 109. That is, the rotation of the dial 109 changes the positional relationship between the detection element and the first reflector 141, the second reflector 142, and the non-reflector 143. The system is configured to detect the phase of the dial 109 by the combination of outputs of the detection element at this time.

[0038] As shown in Figure 7, at least a portion of the non-reflective portion 143 is provided between the first reflective portion 141 on the inner circumference and the second reflective portion 142 on the outer circumference in the radial direction from the center of rotation toward the outer circumference. This prevents false reflection to adjacent reflective portions and prevents false detection.

[0039] If the detection elements are close together, there is a concern that so-called crosstalk will occur, where the light emitted by each element is falsely detected. Therefore, the first detection element 161, the second detection element 162, the third detection element 163, and the fourth detection element 164 must each be placed at a predetermined distance apart. In this embodiment, each of the multiple detection elements is placed on different lines among a plurality of lines that pass through the shaft portion 109a (center of rotation, center of the phase plate 140) and extend radially perpendicular to the shaft portion 109a. That is, no two or more detection elements are placed on the same line among the plurality of lines that extend radially from the center of rotation. Specifically, when viewed from a direction parallel to the shaft portion 109a, each of the multiple detection elements is placed in different ranges among a plurality of ranges (in this embodiment, a range divided into four equal parts) obtained by dividing the phase plate 140 into equal parts using lines that intersect at the shaft portion 109a.

[0040] Furthermore, it is desirable that the distance d1 between the first detection element 161 and the second detection element 162 on the outer circumference, the distance d2 between the third detection element 163 and the fourth detection element 164 on the inner circumference, and the distance d3 between the second detection element 162 and the third detection element 163 are equal. This allows for space-efficient arrangement of the detection elements while preventing false detections. In particular, it allows for space to be created on the opposite side of where the detection elements are arranged, making it possible to miniaturize the camera 100. Note that "equal" includes not only cases where they are strictly equal, but also cases where they are substantially equal (approximately equal).

[0041] In the first detection element 161, the first light-emitting portion 161a, the first light-receiving portion 161b, and the first illumination area 161c are positioned off-center radially from the center of the short side of the outer shape of the first detection element 161. The second detection element 162, the third detection element 163, and the fourth detection element 164 have the same configuration. The first detection element 161 on the outer circumference is arranged so that the first light-emitting portion 161a, the first light-receiving portion 161b, and the first illumination area 161c are radially outward (opposite the side of the shaft portion 109a). Similarly, the second detection element 162 on the outer circumference is arranged so that the second light-emitting portion 162a, the second light-receiving portion 162b, and the second illumination area 162c are radially outward. The third detection element 163 on the inner circumference is positioned so that its third light-emitting portion 163a, third light-receiving portion 163b, and third illumination area 163c are radially inward (towards the shaft portion 109a). Similarly, the fourth detection element 164 on the inner circumference is positioned so that its fourth light-emitting portion 164a, fourth light-receiving portion 164b, and fourth illumination area 164c are radially inward (towards the shaft portion 109a). In other words, the light-emitting portion (second light-emitting portion) of the detection element on the outer circumference and the light-emitting portion (first light-emitting portion) of the detection element on the inner circumference are positioned so that they face outward from each other. This allows the relative distance between the detection elements to be increased, and the diameter of the dial 109 can be reduced in size.

[0042] In this embodiment, the first detection element 161, the second detection element 162, the third detection element 163, and the fourth detection element 164 have the same configuration, but they may have different configurations. For example, the detection sensitivity may be different for the first detection element 161 and the second detection element 162 on the outer circumference and the third detection element 163 and the fourth detection element 164 on the inner circumference. That is, the detection elements on the outer circumference and the detection elements on the inner circumference may output different signals when they receive light of the same intensity. Also, the threshold values ​​for outputting "High=1" and "Low=0" signals may be different. In this case, the reflectance of the first reflector 141 on the inner circumference and the second reflector 142 on the outer circumference may be made different to match the detection elements. This prevents false reflections at adjacent reflectors and prevents false detections.

[0043] The detailed shapes of each component will be explained below with reference to Figure 6. In Figure 6, to simplify the explanation, parts other than those necessary for the explanation have been omitted.

[0044] The click member 130 and the phase plate 140 are pressed against the detection element by the biasing force of the click spring 122 and the click ball 123. As a result, the distance between the phase plate 140 and the detection element remains constant even when the dial 109 is being operated, thereby suppressing errors in the detection output. In other words, the reliability of detection can be increased.

[0045] The click ball 123 and the click groove 130a are coated with a lubricant (not shown) made of fluororesin or fluorooil to improve sliding properties. An edge portion 131, formed in the shape of a vertical wall, is provided on the outer circumference of the click groove 130a. The edge portion 131 is higher than the click groove 130a in the Y direction. This prevents the lubricant from moving due to the rotation of the dial 109 and spilling out of the click member 130. Furthermore, on the outside of the click member 130, the top cover member 111 is provided with a mortar-shaped shielding portion 112 that covers the entire circumference of the click member 130. This prevents the lubricant from spilling out and prevents debris from entering the click groove 130a.

[0046] A vertical wall portion 155 is provided near the detection element, formed by part of the holding member 150 into a vertical wall shape. This prevents light rays from leaking from the detection element into the camera 100. It also prevents light rays from emitting components inside the camera 100 from reaching the detection element. In other words, the reliability of detection can be increased. Preferably, the vertical wall portion 155 is provided on the image sensor 302 side of the camera 100. This prevents light rays from the detection element from reaching the image sensor 302, thereby preventing noise generation in the captured image.

[0047] The operation of phase detection will be explained below with reference to Figures 8 and 9. Figure 8 shows the signal output when the phase of the dial 109 is at position 12 (positions P1-P12). Figure 9 shows the positional relationship between the phase plate 140 and the detection element. Figures 9(a) and 9(b) show the cases for positions P1 and P2, respectively.

[0048] In Figure 9(a), the first detection element 161 is positioned opposite the second reflector 142 at a certain distance, so the system control unit 307 outputs a "High=1" signal. The second detection element 162 is positioned opposite the non-reflector 143 at a certain distance, so the system control unit 307 outputs a "Low=0" signal. The third detection element 163 is positioned opposite the non-reflector 143 at a certain distance, so the system control unit 307 outputs a "Low=0" signal. The fourth detection element 164 is positioned opposite the first reflector 141 at a certain distance, so the system control unit 307 outputs a "High=1" signal. In other words, the combination of signals output from the system control unit 307 when the position is P1 is "1,0,0,1".

[0049] Figure 9(b) shows the state in which the phase plate 140 has rotated 30° counterclockwise in conjunction with the rotation of the dial 109 from the state in Figure 9(a). In Figure 9(b), the first detection element 161 is located opposite the second reflector 142 at a certain distance, so the system control unit 307 outputs a "High=1" signal. The second detection element 162 is located opposite the second reflector 142 at a certain distance, so the system control unit 307 outputs a "High=1" signal. The third detection element 163 is located opposite the non-reflector 143 at a certain distance, so the system control unit 307 outputs a "Low=0" signal. The fourth detection element 164 is located opposite the first reflector 141 at a certain distance, so the system control unit 307 outputs a "High=1" signal. In other words, the combination of signals output from the system control unit 307 when the position is P2 is "1,1,0,1".

[0050] As explained above, the rotation of the dial 109 changes the positional relationship between the detection element and the first reflector 141, the second reflector 142, and the non-reflector 143. As shown in Figure 8, the rotational angle phase of the dial 109 can be detected by a combination of signals output from the system control unit 307. [Examples]

[0051] This embodiment describes a detection mechanism different from that of Embodiment 1. The camera configuration of this embodiment is basically the same as that of camera 100 in Embodiment 1. In this embodiment, only the configurations that differ from those of Embodiment 1 will be described, and the configurations that are common to both Embodiment 1 and Embodiment 1 will not be described.

[0052] Figure 10 shows the positional relationship between the phase plate 170 and the detection elements (first detection element 181, second detection element 182, and third detection element 183) when the dial is in position P1. Figure 11 shows the signal output when the rotation angle phase of the dial 109 is in position 8.

[0053] The first detection element 181, the second detection element 182, and the third detection element 183 have the same configuration as the first detection element 161 described in Embodiment 1. The first reflective portion 171, the second reflective portion 172, and the non-reflective portion 173 of the phase plate 170 have the same configuration as the first reflective portion 141, the second reflective portion 142, and the non-reflective portion 143 described in Embodiment 1.

[0054] In Figure 10, the first detection element 181 is positioned opposite the non-reflective section 173 at a certain distance, so the system control unit 307 outputs a "Low=0" signal. The second detection element 182 is positioned opposite the second reflective section 172 at a certain distance, so the system control unit 307 outputs a "High=1" signal. The third detection element 183 is positioned opposite the non-reflective section 173 at a certain distance, so the system control unit 307 outputs a "Low=0" signal. In other words, the combination of signals output from the system control unit 307 when the position is P1 is "0,1,0". As shown in Figure 11, when the phase plate 170 rotates 45° counterclockwise from the state of position P1, it transitions to position P2, position P3, ..., position P8.

[0055] In this implementation, two detection elements (the first detection element 181 and the second detection element 182) are arranged on the outer circumference. In addition, one detection element (the third detection element 183) is arranged on the inner circumference. That is, there are fewer detection elements on the inner circumference than on the outer circumference. As a result, there is no need to increase the distance between detection elements compared to when multiple detection elements are arranged on the inner circumference, so the diameter of the first reflector 171 can be reduced. In other words, the camera 100 can be miniaturized. [Examples]

[0056] This embodiment describes a click mechanism and phase plate that differ from those in Embodiment 1. The camera configuration in this embodiment is basically the same as that of camera 100 in Embodiment 1. In this embodiment, only the configurations that differ from those in Embodiment 1 will be described, and the configurations that are common to both Embodiment 1 and Embodiment 1 will not be described.

[0057] Figure 12 is an explanatory diagram of the click mechanism and phase plate of this embodiment. Figure 12(a) shows the configuration of the click member 190 and the detection mechanism. Figure 12(b) shows the configuration of the click member 190 and the phase plate 185. Note that the same numbers are used for components that are the same as those described in Figures 5 to 9.

[0058] Click grooves (grooves) 190a are provided on the outer circumference of the click member 190 at predetermined angular intervals in the circumferential direction. The click spring 122 and click ball 123 are housed in the storage section 121. The click ball 123 is assembled in a position corresponding to the irregularities of the click grooves 190a, and the click spring 122 is assembled in a compressed state. In this embodiment, the click spring 122 and click ball 123 are configured to generate a biasing force in a direction perpendicular to the shaft portion 109a of the dial 109. That is, a radial click mechanism is configured. The phase plate 185 is formed from a sheet-like material of resin or metal and is attached to the recessed portion 191 of the click member 190, which has a reduced thickness, with double-sided tape (not shown) or the like. The first detection element 161, the second detection element 162, the third detection element 163, and the fourth detection element 164 are each positioned opposite to one of the four equal parts of the phase plate 185 when viewed from a direction parallel to the shaft portion 109a. Specifically, the phase plate 185 is divided into four equal parts by a virtual line L1 passing through the shaft portion 109a (center of the phase plate 185) and the centers of the click spring 122 and click ball 123, and a virtual line L2 perpendicular to the virtual line L1 and passing through the center of the phase plate 185 (axis of rotation). Within these ranges, the first detection element 161 and the fourth detection element 164 are positioned opposite to the virtual line L2 (opposing each other along the virtual line L2, with the center of the phase plate 185 in between). That is, the first detection element 161 and the fourth detection element 164 are positioned away from the click spring 122 and click ball 123. This prevents the click spring 122 and click ball 123 from falsely reflecting light from the detection element. In other words, it improves the reliability of detection.

[0059] Furthermore, the depth of the recess 191 is greater than the thickness of the phase plate 185. This allows the recess 191 to act as a light shield, preventing external light rays from reaching it. In other words, the reliability of detection can be improved. [Examples]

[0060] This embodiment describes a phase plate different from that of Embodiment 1. The camera configuration of this embodiment is basically the same as that of camera 100 in Embodiment 1. In this embodiment, only the configurations that differ from those of Embodiment 1 will be described, and the configurations that are common to both Embodiment 1 and Embodiment 1 will not be described.

[0061] Figure 13 is an explanatory diagram of the phase plate 195 in this embodiment. Figure 13(a) shows the configuration of the phase plate 195. Figure 13(b) shows the configuration of the insert sheet metal 199.

[0062] The phase plate 195 is formed by insert molding, using an insert sheet metal 199, which is manufactured by metal press working or the like, as the insert component.

[0063] The phase plate 195 has a double arrangement of annular sector-shaped first opening 196 and second opening 197 on the inner and outer sides, with a predetermined central angle. Insert sheet metal 199 is exposed through the first opening 196 and the second opening 197. The surface of the insert sheet metal 199 has a metallic luster. Thus, the insert sheet metal 199 exposed through the first opening 196 and the second opening 197 has the same role as the first reflective portion 141 and the second reflective portion 142 in Embodiment 1. The non-reflective portion 198 has a surface treatment applied to the resin surface to suppress reflection, such as by texturing.

[0064] As described above, the phase plate 195 is constructed by insert molding, with the insert sheet metal 199 as the insert component. This eliminates the need to assemble separate parts, resulting in good assembly efficiency. Furthermore, it reduces errors compared to constructing with separate parts, and improves positional accuracy with respect to the detection element. In other words, it enhances the reliability of detection. In addition, by changing the shapes of the first opening 196 and the second opening 197, it is possible to accommodate changes in the number of detection positions and their positional relationship with the detection element. In this case, there is no need to change the shape of the insert sheet metal 199, and parts can be standardized.

[0065] This embodiment includes the following configuration. (Composition 1) A rotating operating member that rotates around a rotation axis, A phase plate that rotates together with the rotation operating member, comprising a plurality of reflective parts arranged on a plurality of concentric circles centered on the rotation axis and reflecting light, and a non-reflective part that reflects less light than each of the plurality of reflective parts, A plurality of detection elements are arranged on the plurality of concentric circles facing any of the plurality of reflective parts and the plurality of non-reflective parts, and output a signal corresponding to the intensity of light reflected by any of the plurality of reflective parts and the plurality of non-reflective parts. The system includes a determination means for determining the rotational position of the rotational operating member according to the output of each of the plurality of detection elements, The detection mechanism is characterized in that each of the plurality of detection elements is arranged on a different straight line from a plurality of straight lines that pass through the rotation axis and extend radially perpendicular to the rotation axis. (Configuration 2) The detection mechanism according to configuration 1, characterized in that, when viewed from a direction parallel to the rotation axis, the plurality of detection elements are arranged so that they overlap in different ranges from among a plurality of ranges obtained by dividing the phase plate into equal parts equal to the number of detection elements using imaginary lines that intersect the rotation axis. (Composition 3) The plurality of reflective parts include a first reflective part provided on a first concentric circle, and a second reflective part provided on a second concentric circle having a shorter diameter than the first concentric circle. The detection mechanism according to configuration 1 or 2, characterized in that at least a portion of the non-reflective portion is provided between the first reflective portion and the second reflective portion in the radial direction. (Composition 4) The plurality of detection elements comprises first to fourth detection elements arranged in order along the rotation direction of the rotation operating member, The first and second detection elements are arranged on the second concentric circle, The detection mechanism according to configuration 3, characterized in that the third and fourth detection elements are arranged on the first concentric circle. (Composition 5) The detection mechanism according to configuration 4, characterized in that the distance between the first and second detection elements, the distance between the third and fourth detection elements, and the distance between the second and third detection elements are equal. (Composition 6) The number of the first reflectors is one. The detection mechanism according to configuration 4 or 5, characterized in that the number of the second reflective parts is two. (Composition 7) The plurality of detection elements comprises first to third detection elements arranged in order along the rotation direction of the rotation operating member, The first and second detection elements are arranged on the second concentric circle, The detection mechanism according to configuration 3, characterized in that the third detection element is arranged on the first concentric circle. (Composition 8) The number of the first reflectors is two. The detection mechanism according to configuration 7, characterized in that the number of the second reflective parts is one. (Composition 9) The plurality of detection elements include detection elements arranged on a first concentric circle and detection elements arranged on a second concentric circle having a longer diameter than the first concentric circle. The detection elements arranged on the first concentric circle and the detection elements arranged on the second concentric circle each include first and second light-emitting parts that emit the light, The first light-emitting portion is positioned in the radial direction on the side opposite to the rotation axis of the detection element which is arranged on the first concentric circle, The detection mechanism according to any one of configurations 1 to 8, characterized in that the second light-emitting portion is positioned in the radial direction on the side of the rotation axis of the detection element which is arranged on the second concentric circle. (Composition 10) The detection mechanism according to any one of configurations 1 to 9, characterized in that each of the plurality of reflective parts is subjected to a different surface treatment. (Composition 11) The plurality of detection elements include detection elements arranged on a first concentric circle and detection elements arranged on a second concentric circle having a longer diameter than the first concentric circle. A detection mechanism according to any one of configurations 1 to 10, characterized in that the detection elements arranged on the first concentric circle and the detection elements arranged in the second concentric circle output different signals when they receive light of the same intensity. (Composition 12) The device further includes a click member having a groove formed along a direction parallel to the rotation axis, and a click mechanism that generates a click sensation when a spherical member engages with the groove. The detection mechanism according to any one of configurations 1 to 11, characterized in that the outer circumference of the click member is provided with an edge having a wall shape surrounding the groove. (Composition 13) The click mechanism further comprises a click member having a groove formed along a direction perpendicular to the rotation axis, a spherical member that engages with the groove, and a biasing member that biases the spherical member. Within the range divided by a first imaginary line passing through the rotation axis, the center of the spherical member, and the biasing member, and a second imaginary line perpendicular to the first imaginary line and passing through the rotation axis, The detection mechanism according to any one of configurations 1 to 12, characterized in that two of the plurality of detection elements are arranged to face each other along the second virtual line, with the rotation axis in between. (Composition 14) The plurality of reflective parts are subjected to a treatment that reflects the light, The detection mechanism according to any one of configurations 1 to 13, characterized in that the non-reflective portion is subjected to a treatment to suppress the reflection of the light. (Composition 15) A detection mechanism described in any one of configurations 1 to 14, An imaging device characterized by having an image sensor.

[0066] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its gist. [Explanation of Symbols]

[0067] 109 Dial (rotating operating component) 109a Shaft (rotating shaft) 140 Phase plate 141 First reflective section (multiple reflective sections) 142 Second reflective section (multiple reflective sections) 143 Non-reflective part 161 First detection element (multiple detection elements) 162 Second detection element (multiple detection elements) 163 Third detection element (multiple detection elements) 164. Fourth detection element (multiple detection elements) 170 Phase plate 171 First reflective section (multiple reflective sections) 172 Second reflective section (multiple reflective sections) 173 Non-reflective part 181 First detection element (multiple detection elements) 182 Second detection element (multiple detection elements) 183 Third detection element (multiple detection elements) 185 Phase plate 195 Phase plate 198 Non-reflective part 199 Insert sheet metal (multiple reflective sections) 307 System control unit (determination means)

Claims

1. A rotating operating member that rotates around a rotation axis, A phase plate that rotates together with the rotation operating member, comprising a plurality of reflective parts that reflect light and provided on a plurality of concentric circles centered on the rotation axis, and a non-reflective part that reflects less light than each of the plurality of reflective parts, A plurality of detection elements are arranged on the plurality of concentric circles facing any of the plurality of reflective parts and the plurality of non-reflective parts, and output a signal corresponding to the intensity of light reflected by any of the plurality of reflective parts and the plurality of non-reflective parts. The system includes a determination means for determining the rotational position of the rotational operating member according to the output of each of the plurality of detection elements, The detection mechanism is characterized in that each of the plurality of detection elements is arranged on a different straight line from a plurality of straight lines that pass through the rotation axis and extend radially perpendicular to the rotation axis.

2. The detection mechanism according to claim 1, characterized in that, when viewed from a direction parallel to the rotation axis, the plurality of detection elements are arranged so as to overlap in different ranges from among a plurality of ranges obtained by dividing the phase plate into equal parts equal to the number of detection elements using imaginary lines that intersect the rotation axis.

3. The plurality of reflective parts include a first reflective part provided on a first concentric circle, and a second reflective part provided on a second concentric circle having a longer diameter than the first concentric circle. The detection mechanism according to claim 1 or 2, characterized in that at least a portion of the non-reflective portion is provided between the first reflective portion and the second reflective portion in the radial direction.

4. The plurality of detection elements comprises first to fourth detection elements arranged sequentially along the rotation direction of the rotation operating member, The first and second detection elements are arranged on the second concentric circle, The detection mechanism according to claim 3, characterized in that the third and fourth detection elements are arranged on the first concentric circle.

5. The detection mechanism according to claim 4, wherein the distance between the first and second detection elements, the distance between the third and fourth detection elements, and the distance between the second and third detection elements are equal.

6. The number of the first reflectors is one, The detection mechanism according to claim 4, characterized in that the number of the second reflective parts is two.

7. The plurality of detection elements comprises first to third detection elements arranged in order along the rotation direction of the rotation operating member, The first and second detection elements are arranged on the second concentric circle, The detection mechanism according to claim 3, characterized in that the third detection element is arranged on the first concentric circle.

8. The number of the first reflectors is two, The detection mechanism according to claim 7, characterized in that the number of the second reflective section is one.

9. The plurality of detection elements include detection elements arranged on a first concentric circle and detection elements arranged on a second concentric circle having a larger diameter than the first concentric circle. The detection elements arranged on the first concentric circle and the detection elements arranged on the second concentric circle each include first and second light-emitting parts that emit the light, The first light-emitting portion is positioned in the radial direction on the side opposite to the rotation axis of the detection element which is arranged on the first concentric circle, The detection mechanism according to claim 1 or 2, characterized in that the second light-emitting portion is positioned in the radial direction on the side of the rotation axis of the detection element which is arranged on the second concentric circle.

10. The detection mechanism according to claim 1 or 2, characterized in that each of the plurality of reflective parts is subjected to a different surface treatment.

11. The plurality of detection elements include detection elements arranged on a first concentric circle and detection elements arranged on a second concentric circle having a larger diameter than the first concentric circle. The detection mechanism according to claim 1 or 2, characterized in that the detection element arranged on the first concentric circle and the detection element arranged in the second concentric circle output different signals when they receive light of the same intensity.

12. The device further includes a click member having a groove formed along a direction parallel to the rotation axis, and a click mechanism that generates a click sensation when a spherical member engages with the groove. The detection mechanism according to claim 1 or 2, characterized in that the outer circumference of the click member is provided with an edge having a vertical wall shape surrounding the groove.

13. The click mechanism further comprises a click member having a groove formed along a direction perpendicular to the rotation axis, a spherical member that engages with the groove, and a biasing member that biases the spherical member. The detection mechanism according to claim 1 or 2, characterized in that, in a range divided by a first imaginary line passing through the rotation axis, the center of the spherical member, and the biasing member, and a second imaginary line perpendicular to the first imaginary line and passing through the rotation axis, two of the plurality of detection elements are arranged to face each other along the second imaginary line, straddling the rotation axis.

14. The plurality of reflective parts are subjected to a treatment that reflects the light, The detection mechanism according to claim 1 or 2, characterized in that the non-reflective portion is subjected to a treatment that suppresses the reflection of the light.

15. The detection mechanism according to claim 1 or 2, An imaging device characterized by having an image sensor.

Images