TWI582394B - Rotatable operating member and electronic device having the same - Google Patents

Description

Rotatable operating member and electronic device having the same

The present invention relates to a rotatable operating member and an electronic device having the same, and in particular to a technique for detecting the rotation of an operating member possessed by the electronic device.

The electronic device is equipped with various operating members such as a push button type, a slide type, and a rotary type to perform various processes and operations. Various sensors are used as means to detect when these operating members are being operated. For example, a technique of detecting the rotation of a rotatable ring as an exemplary rotary operation member using a light reflector has been proposed (refer to Japanese Patent Laid-Open Publication No. 2007-64665).

Specifically, reflective surfaces having different reflectivities are alternately disposed on the rotatable ring at predetermined rotational angular intervals, and when the rotatable ring is operated, the photodetectors are selectively turned on and off (lighted/unioned). As a result, the rotation of the rotatable ring was detected. Here, a method of disposing a reflecting surface having different reflectances on a rotatable ring includes: a method of directly forming a reflecting surface on an inner peripheral surface of an annular member, and attaching a reflecting sheet A method of attaching to the inner peripheral surface of the annular member.

However, if a rotatable ring is manufactured by directly forming reflecting surfaces having different reflectances on the annular member, there arises a problem of increasing manufacturing (processing) cost. On the other hand, when the rotatable ring is manufactured by attaching the reflection sheet to the annular member, the manufacturing cost is reduced as compared with the case where the reflection surface is directly formed on the annular member. However, in the rotatable ring capable of 360-degree rotation, it is necessary to attach a reflection sheet to the entire circumference of the inner peripheral surface of the annular member. In this case, if a slight gap is formed at the joint between the reflection sheets, or if there is a slight overlap at the junction of the reflection sheets, the change in reflectance is irregular, which may detect the rotation angle. Causes false detection.

The present invention provides a rotatable operating member that reduces manufacturing costs and prevents erroneous detection of a rotation angle.

Accordingly, a first aspect of the present invention provides a rotatable operating member comprising: a member constructed to have a circumferential surface; and a sheet configured to be fixed to the peripheral surface, wherein the sheet is The reflectance of the surface is different from the reflectance of the peripheral surface of the member, wherein the sheet has a plurality of holes formed side by side in the circumferential direction of the peripheral surface, wherein in the sheet, the circumference A portion of the face is exposed from the hole, and the sheet is fixed to the peripheral surface in such a manner that both ends of the sheet are opposed to each other in the circumferential direction, and wherein the hole has the hole in the circumference a gap of width in the circumferential direction that is substantially equal in width, the gap setting Between the ends of the sheet.

Accordingly, a second aspect of the present invention provides a rotatable operating member comprising: a member constructed to have a circumferential surface; and a sheet configured to be fixed to the peripheral surface, wherein the sheet includes a first reflective region having a first reflectivity and a second reflective region having a second reflectivity, wherein a difference between a reflectance of the peripheral surface and the second reflectance is greater than the first reflectance The difference between the second reflectances is small, wherein the sheet is alternately disposed on the peripheral surface in the circumferential direction with the first reflective region and the second reflective region, and both ends of the sheet Fixed to the circumferential surface in a circumferential direction opposite to each other, wherein a gap having a width in the circumferential direction substantially equal to a width of the second reflection region in the circumferential direction is provided in the sheet Between the ends of the sheet, and wherein the gap is sandwiched between the first reflective regions of the sheet.

Accordingly, a third aspect of the present invention provides an electronic device including: a member constructed to have a circumferential surface; a sheet configured to be fixed to the peripheral surface; and an output unit configured to face the The sheet projects light, receives light reflected on the sheet, and based on the received light output signal, wherein a reflectance of a surface of the sheet is different from a reflectance of the peripheral surface of the member, wherein The sheet has a plurality of holes formed side by side in the circumferential direction of the circumferential surface, wherein in the sheet, a part of the peripheral surface is exposed from the hole, the sheet being such that the sheet The both ends are fixed to the circumferential surface in such a manner as to face each other in the circumferential direction, and a gap having a width in the circumferential direction substantially equal to a width of the hole in the circumferential direction is provided in the sheet Between the ends.

Accordingly, a fourth aspect of the present invention provides an electronic device including: a member constructed to have a circumferential surface; and a sheet member configured to be fixed to the peripheral surface, and an output unit configured to face the The sheet projects light, receives light reflected on the sheet, and outputs a signal based on the received light, wherein the sheet includes a first reflective region having a first reflectivity and a second reflective having a second reflectivity a region, wherein a difference between a reflectance of the peripheral surface and the second reflectance is smaller than a difference between the first reflectance and the second reflectance, wherein the sheet is the A reflection region and the second reflection region are alternately arranged on the circumferential surface in the circumferential direction, and both ends of the sheet are fixed to the circumferential surface in a circumferential direction opposite to each other, wherein a gap of a width in the circumferential direction in which the width of the second reflection area is substantially equal in the circumferential direction is disposed between both ends of the sheet, and wherein the gap is sandwiched by the sheet Between the first reflective regions.

According to the present invention, the manufacturing cost of the rotatable member is reduced. Moreover, erroneous detection when detecting the rotation angle of the operating member is prevented.

Further features of the present invention will become apparent from the description of exemplary embodiments.

1‧‧‧ camera equipment

1a‧‧‧ body unit

1b‧‧‧Cylinder unit

2‧‧‧ camera lens

3‧‧‧200

4‧‧‧Rotatable ring

4e‧‧‧Protruding

5‧‧‧Cylinder exterior

6‧‧‧ Cover

6a‧‧‧ slot

7‧‧‧ ring members

8‧‧‧Base components

9‧‧‧Flexible wiring substrate

10a, 10b‧‧‧Light reflector

11‧‧‧Sheet

11a‧‧‧Non-glossy surface

11b‧‧‧ hole

12‧‧‧Annual members

12a‧‧‧Glossy face

12b‧‧‧ gap

21‧‧‧Sheet

21a‧‧‧Glossy face

21b‧‧‧ hole

22‧‧‧Annual members

22a‧‧‧Non-glossy surface

22b‧‧‧ gap

24‧‧‧Rotatable ring

31‧‧‧Sheet

31a‧‧‧Glossy face

31b‧‧‧Non-glossy surface

34‧‧‧Rotatable ring

41‧‧‧Sheet

41a‧‧‧ shiny side

41b‧‧‧Non-glossy surface

44‧‧‧ Rotatable ring

51‧‧‧Sheet

51a‧‧‧Non-glossy surface

51b‧‧‧ hole

51c‧‧‧First convex

51d‧‧‧second convex

54‧‧‧Rotatable ring

62‧‧‧ ring members

62a‧‧‧Glossy face

62b‧‧‧ gap

62c‧‧‧ first mark

62d‧‧‧second mark

64‧‧‧Rotatable ring

A, B‧‧‧Width

L‧‧‧ optical axis

M‧‧‧Line parallel to the thrust direction of the ring member

PR 10a, PR 10b‧‧‧Light reflector

S‧‧‧ area

Α‧‧‧ rising edge

1 is a perspective view showing an appearance of an image pickup apparatus as an exemplary electronic device according to an embodiment of the present invention.

Fig. 2A is a cross-sectional view schematically showing a configuration of a cylindrical unit constituting the image pickup apparatus of Fig. 1.

Fig. 2B is a partial enlarged view showing the cylindrical unit of Fig. 2A.

3A is a perspective view of a rotatable ring in accordance with a first embodiment of the present invention.

Fig. 3B is a plan development view showing an inner peripheral surface of the rotatable ring in Fig. 3A.

Fig. 4 is an exploded perspective view showing a cylindrical unit constituting the image pickup apparatus of Fig. 1.

FIG. 5A is a diagram showing an exemplary signal waveform output from a light reflector when the rotatable ring of FIG. 4 is rotated clockwise.

Figure 5B is a diagram showing an exemplary signal waveform output from a light reflector when the rotatable ring of Figure 4 is rotated counterclockwise.

Fig. 6A is a plan development view showing an inner peripheral surface of a rotatable ring according to a second embodiment of the present invention.

Fig. 6B is a plan development view showing an inner peripheral surface of a rotatable ring according to a third embodiment of the present invention.

Fig. 6C is a plan development view showing an inner peripheral surface of a rotatable ring according to a fourth embodiment of the present invention.

Fig. 7A is a plan development view showing an inner peripheral surface of a rotatable ring according to a fifth embodiment of the present invention.

Fig. 7B is a plan development view showing an inner peripheral surface of a rotatable ring according to a sixth embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an appearance of an image pickup apparatus 1 according to an embodiment of the present invention. The image pickup apparatus 1 is an exemplary electronic apparatus according to the present invention. The image pickup apparatus 1 mainly includes a main body unit 1a and a cylindrical unit 1b. The main unit 1a has an imaging device, an image processing circuit, a signal processing circuit, a memory card, and the like, which are not shown. The imaging device subjects the optical image of the object to photoelectric conversion. The image processing circuit converts the analog signal output by the imaging device into a digital image signal, and performs predetermined image processing on the digital image signal to generate image data. The signal processing circuit detects the rotation of the rotatable ring 4 in accordance with a signal from the light reflectors 10a and 10b (see Fig. 4) provided to the cylindrical unit 1b which will be described later, which will be described later. The memory card stores image data output by the image processing loop.

The cylindrical unit 1b is disposed near the center of the front side of the main body unit 1a. The cylindrical unit 1b has an imaging lens 2 and a barrel 3. The imaging lens 2 forms an image of an object to be formed on the imaging device. The cartridge 3 has a shutter device and a diaphragm device, which are not shown, which control the amount of light reaching the image pickup device.

The rotatable ring 4, the cylindrical outer casing 5, and the cover 6 according to the first embodiment of the present invention are disposed on the outer circumference of the cylindrical unit 1b. The rotatable ring 4 is a rotatable operating member that is operated to control the sensitivity of the image pickup device and to change various imaging parameters such as a shutter speed. In the image pickup apparatus 1, it is allowed to set in advance an image pickup parameter capable of changing a set value by operating the rotatable ring 4 using a setting means not shown. Therefore, it is possible to change the desired setting in advance by rotating the rotatable ring 4 The setting value of the camera parameter. It should be noted that the cover 6 and the cylinder exterior 5 will be described later with reference to FIG. Moreover, since other components of the image pickup apparatus 1 are not directly related to the present invention, a description thereof will be omitted.

Fig. 2A is a cross-sectional view schematically showing the structure of the cylindrical unit 1b. Fig. 2B is a partial enlarged view showing a region S in Fig. 2A. Since the components such as the image pickup lens 2 and the like disposed inside the cartridge 3 are not directly related to the present invention, these components are omitted in FIGS. 2A and 2B.

The cylindrical unit 1b has a base member 8 disposed on the outer circumference of the barrel 3. The cover 6 is disposed at the end of the base member 8 (on the side of the subject). The rotatable ring 4 and the cylindrical outer casing 5 are arranged on the outer circumference of the base member 8. The cylindrical outer casing 5 and the base member 8 are fixed to the main body unit 1a via a member not shown. The cover 6 is fixed to the main body unit 1a via a base member 8 by a screw, not shown, so that the rotatable ring 4 can be caught between the cover 6 and the cylindrical outer casing 5. The rotatable ring 4 is sandwiched between the cylindrical outer casing 5 and the cover 6 in the optical axis L direction of the cylinder 3, thus preventing movement of the rotatable ring 4 in the optical axis L direction except for a predetermined play. However, the movement of the rotatable ring 4 in the direction of rotation about the optical axis L is not prevented, and the movement of the rotatable ring 4 enables 360-degree rotation.

The groove 6a is formed on the cover 6. A ring member 7 made of a rubber material as an exemplary resin material is fitted into the groove 6a. The inner diameter of the ring member 7 itself is smaller than the outer diameter of the groove 6a, and thus the ring member 7 is fitted into the groove 6a while being stretched. At a position where the rotatable ring 4 is sandwiched between the cylindrical outer casing 5 and the cover 6 in the optical axis L direction, the ring member 7 is disposed in a rotatable manner in the vertical direction (radial direction) of the optical axis L direction. Projection 4e on ring 4 Apply force (pressurization) and compression. The projections 4e are provided at substantially equal intervals in the circumferential direction at three positions on the inner circumference of the rotatable ring 4, and as a result, the ring member 7 is biased by the projections 4e in a uniform manner. When the rotatable ring 4 is rotated, the biasing force of the ring member 7 by the protrusion 4e adds a predetermined operational load to the rotatable ring 4, which prevents accidental rotation of the rotatable ring 4 and improves the convenience of operation. It should be noted that the protrusions 4e may be disposed at four or more locations.

FIG. 3A is a perspective view showing the rotatable ring 4. FIG. 3B is a plan development view showing an inner circumferential surface (circumferential surface) of the rotatable ring 4. The rotatable ring 4 has an annular member 12 and a sheet 11 attached to the inner peripheral surface of the annular member 12.

For example, the annular member 12 is fabricated by grinding an aluminum member. The outer circumference of the annular member 12 is uneven, and the surface thereof is processed to be rough by grit blasting. This prevents finger slippage when the outer peripheral surface of the rotatable ring 4 is held to rotate the rotatable ring 4, and the convenience of the operation is improved. At least the region of the inner circumferential surface of the annular member 12 on which the sheet 11 is mounted is processed as a glossy surface 12a as an exemplary surface having high reflectance.

The sheet 11 is attached to the inner peripheral surface of the annular member 12 such that both ends of the sheet 11 face each other in the circumferential direction of the annular member 12. The surface of the sheet 11 is a non-glossy surface 11a as an exemplary surface having a low reflectance.

It should be noted that in Fig. 3B, in order to distinguish the non-glossy face 11a from the glossy face 12a, the non-glossy face 11a is indicated by hatching for convenience. And, for the same reason, it’s also marked with a hatching The non-gloss surface illustrated in FIGS. 6A, 6B, 6C, 7A, and 7B.

The material of the sheet 11 is not limited. In the sheet 11, a plurality of holes 11b having a predetermined width A are formed side by side with a space width A in the longitudinal direction corresponding to the circumferential direction of the annular member 12. That is, the non-glossy surface 11a between the adjacent holes 11b in the sheet 11 also has a width A. The length of the sheet 11 is determined in advance so that the gap 12b having the predetermined width B can be formed between the opposite ends of the annular member 12 in the circumferential direction. The width B of the gap 12b is set to a value substantially equal to the width A of the hole 11b.

It should be noted that the gloss of the surface depends primarily on the personal opinion of the person viewing the surface. However, in the present embodiment, the glossy side and the non-glossy side are used as a typical combination of surfaces having different reflectivities. As will be described later, in the present embodiment, the light beam is directed from the light-emitting unit of the light reflector as an exemplary optical sensor to the inner circumferential surface of the rotatable ring 4. The rotation of the rotatable ring 4 is detected based on a signal indicating whether light reflected from the inner peripheral surface of the rotatable ring 4 has been received by the light receiving unit of the photo reflector. Therefore, the glossy surface serves as an exemplary surface that generates reflected light that can be received by the light receiving unit of the light reflector, and the non-gloss surface serves as an exemplary surface that generates reflected light that cannot be received by the light receiving unit of the light reflector. Therefore, the inner circumferential surface of the annular member 12 and the surface of the sheet 11 need only have a reflectance difference capable of being recognized by the light reflector and whether or not the reflected light can be received.

On the inner peripheral surface of the rotatable ring 4, the glossy surface 12a as the inner peripheral surface of the annular member 12 is itself exposed to the hole 11b and the gap 12b. Each area. Therefore, the non-glossy faces 11a between the shiny faces 12a of the respective regions exposed to the holes 11b and the gaps 12b and the adjacent holes 11b of the sheet 11 are alternately disposed over the entire circumference of the inner peripheral surface of the rotatable ring 4 . In the present embodiment, the holes 11b and the gaps 12b are designed to have a width corresponding to four degrees, and the area having the width A between the adjacent holes 11b is also designed to have a width corresponding to four degrees. Therefore, the glossy surface 12a and the non-glossy surface 11a are alternately arranged at an octave pitch of four degrees.

Here, it is assumed that when the sheet is mounted on the inner peripheral surface of the annular member, no gap is left between the both ends of the sheet, a minute gap may be formed between both ends of the sheet, or both ends of the sheet may exist In the case of a slight overlap, the end faces of the sheets are joined together. On the other hand, when the sheet is attached to the inner peripheral surface of the annular member 12, the gap between the both ends of the sheet 11 is prevented by intentionally providing the gap 12b having the width B between the both ends of the sheet 11. Small gaps or overlaps. As a result, as will be described later, erroneous detection is prevented when detecting the rotation of the rotatable ring 4.

In FIGS. 3A and 3B, two light reflectors 10a and 10b for detecting the rotation of the rotatable ring 4 are shown, and in FIG. 3A, two light reflectors 10a and 10b are shown. Flexible wiring substrate 9.

The light emitting unit and the light receiving unit of the light reflectors 10a and 10b are disposed inside the rotatable ring 4 in such a manner as to face the outer peripheral side of the rotatable ring 4. In order to detect the rotation of the rotatable ring 4 using the light reflectors 10a and 10b, surfaces having different reflectances must be at least alternately disposed on the inner peripheral surface of the rotatable ring 4 opposite to the light reflectors 10a and 10b. Here, As described earlier, the inner circumferential surface of the annular member 12 is processed into a glossy surface 12a. Therefore, the distance between the inner circumferential surface of the annular member 12 and the light reflectors 10a and 10b is determined such that light projected from the light emitting units of the light reflectors 10a and 10b to the glossy surface 12a and reflected on the glossy surface 12a can be lighted The light receiving units of the reflectors 10a and 10b are received. In this case, the reflectance of the non-glossy surface 11a as the surface of the sheet 11 is set to reflectance from the light-emitting unit of the light reflectors 10a and 10b to the non-glossy surface 11a and on the non-glossy surface 11a. The reflected light cannot be detected by the light receiving unit of the photo reflectors 10a and 10b. This causes the light receiving units of the light reflectors 10a and 10b to be alternately in the light receiving state and the non-light receiving state, and can transmit the signal indicating the light receiving state and the signal indicating the non-light receiving state to the camera device 1 The signal processing loop shown.

How to detect the rotation angle when the rotatable ring 4 is rotated will now be described. Fig. 4 is an exploded perspective view showing the cylindrical unit 1b and showing the rotatable ring 4 and its surrounding members. The flexible wiring substrate 9 is fixed to the base member 8, and the two light reflectors 10a and 10b are mounted on the flexible wiring substrate 9. The pitch at which the light reflectors 10a and 10b are arranged is determined in such a manner that, as shown in FIG. 3B, when one of the light reflectors 10a and 10b is placed at a position opposite to the substantially center of the glossy surface 12a (the hole 11b or the gap 12b) The other of the light reflectors 10a and 10b can be disposed at a position opposite to the boundary between the glossy surface 12a and the non-gloss surface 11a. This maximizes the phase difference between the signal waveforms output by the two light reflectors 10a and 10b.

In order to detect the direction of rotation of the rotatable ring 4, there is a need for a phase difference between the signal waveforms output by the two light reflectors 10a and 10b. That is, when the light reflector 10a has received the light, whether or not the light reflector 10b has received light needs to be changed according to the rotation direction of the rotatable ring 4. Based on the phase difference, a signal processing loop is used to determine the direction of rotation of the rotatable ring 4.

Fig. 5A shows signal waveforms outputted by the light reflectors 10a and 10b when the rotatable ring 4 is rotated in the clockwise direction (CW) (see Fig. 4) as seen from the rear of the image pickup apparatus 1. Fig. 5B shows the signal waveforms outputted by the light reflectors 10a and 10b when the rotatable ring 4 is rotated in a counterclockwise direction (CCW) (see Fig. 4) opposite to the clockwise direction. It should be noted that in FIGS. 5A and 5B, the photo reflector 10a is denoted as PR10a, and the photo reflector 10b is denoted as PR10b. When the signal waveform is high, this indicates that the light reflectors 10a and 10b are receiving light, and when the signal waveform is low, this indicates that the light reflectors 10a and 10b are not receiving light.

When there is no phase difference between the signal waveforms outputted by the light reflectors 10a and 10b, regardless of the direction in which the rotatable ring 4 is rotated, the signal waveforms outputted by the light reflectors 10a and 10b are the same, and therefore, the rotatable cannot be detected. The direction of rotation of the ring 4. On the other hand, when there is only a small phase difference between the signal waveforms output from the light reflectors 10a and 10b, the judgment as to whether or not there is a phase difference may change, and the rotation direction may be erroneously detected.

Therefore, in the cylindrical unit 1b, the signal waveforms outputted by the light reflectors 10a and 10b have a phase difference corresponding to about half of the phase. When the rotatable ring 4 is rotated clockwise, the light receiving state of the light receiving unit of the light reflector 10a changes in a manner of (1) high, (2) high, (3) low, and (4) low, light The light receiving state of the light receiving unit of the reflector 10b is changed in a manner of (1) high, (2) low, (3) low, and (4) high. When the rotatable ring 4 is rotated counterclockwise, the light receiving state of the light receiving unit of the light reflector 10a is changed in the manner of (1) high, (2) high, (3) low, and (4) low, The light receiving state of the light receiving unit of the photo reflector 10b changes in a manner of (1) low, (2) high, (3) high, and (4) low. When such an order is observed, the direction of rotation of the rotatable ring 4 can be detected no matter what time the rotation starts. Based on the above order of the light reflectors 10a and 10b from (1) to (4), the unillustrated signal processing circuit provided to the main body unit 1a determines the rotation of the rotatable ring 4 regardless of the rotation direction and the rotation start position. The angle, that is, the rotation of the ring 4 has been determined to have been rotated by one pitch (one cycle).

As described above, on the inner peripheral surface of the rotatable ring 4, the glossy surface 12a itself is exposed to the hole 11b and the gap 12b, and the non-glossy faces 11a of the sheet 11 are alternately arranged in the circumferential direction at intervals of about four degrees. All week. Therefore, on the inner peripheral surface of the rotatable ring 4, the glossy surface 12a itself is exposed at a total of 45 positions. Therefore, the rotation of the rotatable ring 4 can be detected whenever the rotatable ring 4 is rotated by octaves. In FIGS. 5A and 5B, the interval between adjacent rising edges α of the signals from the light reflector 10a corresponds to the octave rotation of the rotatable ring 4.

As described above, the rotatable ring 4 is manufactured such that all the regions on the inner circumferential surface of the annular member 12 on which the sheet 11 is mounted can be Glossy face 12a. For this reason, molding and machining are easier than forming a reflecting surface having a different reflectance directly on the inner peripheral surface of the annular member 12, which lowers the manufacturing cost. Further, the sheet 11 is attached to the inner peripheral surface of the annular member 12, wherein the surface of the sheet 11 is a non-glossy surface 11a and has a hole 11b having a width A and formed side by side at intervals of the width A. This forms a gap 12b between the opposite ends of the sheet 11 in the circumferential direction and exposes the glossy surface 12a having a width B substantially equal to the width A. As a result, the rotation angle and the rotation direction of the rotatable ring 4 are correctly detected without erroneous detection, and further, the reliability of the image pickup apparatus 1 is improved.

Next, referring to Fig. 6A, a rotatable operation member according to a second embodiment of the present invention will be described. Fig. 6A is a plan development view showing an inner circumferential surface of a rotatable ring 24 according to a second embodiment of the present invention. As will be explained below, the rotatable ring 24 has a configuration in which the positions of the glossy surface and the non-gloss surface are opposite to the positions of the glossy surface and the non-gloss surface on the inner circumferential surface of the rotatable ring 4 as described above.

The rotatable ring 24 has an annular member 22 and a sheet 21 attached to the inner peripheral surface of the annular member 22. The annular member 22 is different from the above-described annular member 12 in that the inner peripheral surface of the annular member 22 is formed as a non-glossy surface 22a, and the other arrangement is the same as the arrangement of the above-described annular member 12.

In the sheet 21, a plurality of holes 21b having a predetermined width A are formed side by side at intervals of the width A in the longitudinal direction corresponding to the circumferential direction of the annular member 22. The surface of the sheet 21 is a glossy surface 21a. With width B The gap 22b is formed between the opposite ends of the circumferential direction in a state where the sheet 21 is attached to the annular member 22. In the rotatable ring 24, the non-glossy face 22a of the annular member 22 itself is exposed to a width formed in a region of the sheet 21 having the hole 21b of the width A and between the both ends opposed to each other in the circumferential direction. In the region of the gap 22b of B. It should be noted that the sheet 21 is constructed such that the width B is substantially equal to the width A. The definition of the glossy surface 21a and the non-gloss surface 22a provided on the inner peripheral surface is the same as defined in the above-described first embodiment.

When the rotatable ring 24 is applied to the cylindrical unit 1b, the glossy surface 21a of the sheet 21 is controlled to have a reflectance: when light is projected from the light-emitting unit of the light reflectors 10a and 10b to the glossy surface 21a, from the gloss The light reflected by the face 21a can be detected by the light receiving units of the light reflectors 10a and 10b. On the other hand, the non-glossy face 22a of the annular member 22 is controlled to have a reflectance: when light is projected from the light-emitting unit of the light reflectors 10a and 10b to the non-glossy face 22a, the light reflected from the non-glossy face 22a is not It can be detected by the light receiving unit of the light reflectors 10a and 10b. As a result, the glossy side and the non-glossy side having the width A are formed substantially in the entire circumference of the inner peripheral surface of the rotatable ring 24 at intervals of the width A.

Therefore, when the rotatable ring 24 is rotated, the waveform signals obtained from the light reflectors 10a and 10b are waveform signals shifted by a half cycle from the phase explained above with reference to Figs. 5A and 5B. Therefore, as the rotation angle and the rotation direction of the rotatable ring 4 according to the first embodiment are rotated, when the rotatable ring 24 is rotated, the rotation angle and the rotation direction of the rotatable ring 24 can be detected. As a result, the rotatable ring 24 is also obtained The same effect as that obtained by the rotatable ring 4.

Next, referring to Fig. 6B, a rotatable operation member according to a third embodiment of the present invention will be described. Fig. 6B is a plan development view showing an inner peripheral surface of the rotatable ring 34 according to the third embodiment of the present invention. The rotatable ring 34 has an annular member 12 and a sheet 31 attached to the inner peripheral surface of the annular member 12. The annular member 12 is the same as the annular member 12 of the above-described first embodiment, and the inner peripheral surface of the annular member 12 is a glossy surface 12a.

The sheet 31 is constructed such that the non-glossy surface 31b having the width A as the first reflective area and the glossy surface 31a having the width A as the second reflective area are in the length of the sheet 31 corresponding to the circumferential direction of the annular member 12. The directions are alternately formed side by side. In the sheet 31, the glossy surface 31a is sandwiched between a part of the non-glossy surface 31b in the width direction perpendicular to the longitudinal direction (the vertical direction as viewed from Fig. 6B), but the non-gloss at the end portion in the width direction Face 31b is not always necessary.

A sheet obtained by forming a glossy surface 31a on a sheet by printing or the like in the case where the entire surface of the sheet is the non-glossy surface 31b can be used as the sheet 31, or a glossy surface can be used on the entire surface of the sheet. In the case of 31a, a sheet obtained by forming a non-glossy surface 31b on a sheet by printing or the like is used as the sheet 31, but this is not limitative.

In the case where the sheet 31 is attached to the inner peripheral surface of the annular member 12, the gap 12b having the width B is formed between the opposite ends of the sheet 31 in the circumferential direction of the annular member 12. The sheet 31 is constructed such that the width B is substantially equal to the width A.

The relationship between the reflectance of the shiny surface 31a and the non-glossy surface 31b of the surface of the sheet 31 and the reflectance of the shiny surface 12a of the inner peripheral surface of the annular member 12 will now be described. A difference in reflectance is required between the glossy surface 31a and the non-gloss surface 31b, so that the light reflectors 10a and 10b can receive the light reflected from the glossy surface 31a, but cannot receive the light reflected from the non-gloss surface 31b. The gap 12b in which the glossy surface 12a itself is exposed needs to be sandwiched by the non-glossy surface 31b in the circumferential direction of the annular member 12. A difference in reflectance is also required between the glossy face 12a and the non-gloss face 31b, and the light reflectors 10a and 10b are capable of receiving light reflected from the glossy face 12a, but cannot receive light reflected from the non-gloss face 31b. Therefore, the reflectance of the glossy surface 31a, the non-gloss surface 31b, and the glossy surface 12a is determined in such a manner that the difference in reflectance between the glossy surface 12a and the glossy surface 31a can be smaller than the difference in reflectance between the non-glossy surface 31b and the glossy surface 31a. . As a result, when the rotatable ring 34 is rotated, the waveform signals obtained from the light reflectors 10a and 10b can be the same as those described with reference to Figs. 5A and 5B.

For example, the glossy surface 12a is controlled to have a reflectance: when light is projected from the light emitting unit of the light reflectors 10a and 10b to the glossy surface 12a, light reflected from the glossy surface 12a can be received by the light of the light reflectors 10a and 10b The unit detected. The glossy surface 31a of the sheet 31 is controlled to have the same reflectance as that of the glossy surface 12a. On the other hand, the non-glossy surface 31b of the sheet 31 is controlled to have a reflectance: when light is projected from the light-emitting unit of the photo reflectors 10a and 10b to the non-glossy surface 31b, the light reflected from the non-glossy surface 31b cannot be It is detected by the light receiving unit of the light reflectors 10a and 10b.

Therefore, as the rotation angle and the rotation direction of the rotatable ring 4 according to the first embodiment are rotated, when the rotatable ring 34 is rotated, the rotation angle and the rotation direction of the rotatable ring 34 can be detected. As a result, the rotatable ring 34 also achieves the same effect as that obtained by the rotatable ring 4.

Next, referring to Fig. 6C, a rotatable operation member according to a fourth embodiment of the present invention will be described. Fig. 6C is a plan development view showing an inner peripheral surface of the rotatable ring 44 according to the fourth embodiment of the present invention. The rotatable ring 44 has an annular member 22 and a sheet 41 attached to the inner peripheral surface of the annular member 22. The annular member 22 is the same as the annular member 22 of the second embodiment described above, and the inner peripheral surface of the annular member 22 is a non-glossy surface 22a.

The sheet 41 is constructed such that the glossy surface 41a as the first reflection region having the width A and the non-gloss surface 41b as the second reflection region having the width A are in the length of the sheet 41 corresponding to the circumferential direction of the annular member 22. The directions are alternately formed side by side. In the sheet 41, the non-glossy surface 41b is sandwiched between a part of the glossy surface 41a in the width direction perpendicular to the longitudinal direction (the vertical direction as viewed from FIG. 6C), but the glossy surface at the end portion in the width direction 41a is not always necessary.

A sheet obtained by forming a non-glossy surface 41b on a sheet by printing or the like in the case where the entire surface of the sheet is the shiny surface 41a may be used as the sheet 41, or may be used as a non-glossy surface on the entire surface of the sheet. In the case of the surface 41b, a sheet obtained by forming the glossy surface 41a on the sheet by printing or the like is used as the sheet 41, but this is not limitative.

In the case where the sheet 41 is attached to the inner circumferential surface of the annular member 22, the gap 22b having the width B is formed between the opposite ends of the sheet 41 in the circumferential direction of the annular member 22. The sheet 41 is constructed such that the width B is substantially equal to the width A.

The relationship between the reflectance of the shiny surface 41a and the non-glossy surface 41b of the surface of the sheet 41 and the reflectance of the non-glossy surface 22a of the inner peripheral surface of the annular member 22 is the same as that of the above-described sheet 31 according to the third embodiment. The relationship between the reflectance of the shiny surface 31a of the surface and the non-glossy surface 31b and the reflectance of the shiny surface 12a of the inner peripheral surface of the annular member 12 are the same. Therefore, the gloss surface 41a, the non-gloss surface 41b, and the non-gloss surface 22a are determined such that the difference in reflectance between the non-glossy surface 22a and the non-glossy surface 41b can be smaller than the difference in reflectance between the non-glossy surface 41b and the shiny surface 41a. Reflectivity. As a result, when the rotatable ring 44 is rotated, the waveform signals obtained from the photo reflectors 10a and 10b are the same as those of the waveform signals having the phase shifted by half a cycle explained above with reference to Figs. 5A and 5B.

For example, the glossy surface 41a of the sheet 41 is controlled to have a reflectance: when light is projected from the light-emitting unit of the light reflectors 10a and 10b to the glossy surface 41a, light reflected from the glossy surface 41a can be light-receiver 10a and The light receiving unit of 10b is detected. On the other hand, the non-glossy face 22a exposed from the gap 22b between both ends of the sheet 41 is controlled to have a reflectance when light is projected from the light-emitting unit of the light reflectors 10a and 10b to the non-glossy face 22a, Light reflected from the non-glossy surface 22a cannot be detected by the light receiving units of the photo reflectors 10a and 10b. The non-glossy surface 41b of the sheet 41 is controlled to have the same inverse as that of the non-glossy surface 22a. Rate of incidence.

Therefore, as the rotation angle and the rotation direction of the rotatable ring 4 according to the first embodiment are rotated, when the rotatable ring 44 is rotated, the rotation angle and the rotation direction of the rotatable ring 44 can be detected. As a result, the rotatable ring 44 also achieves the same effect as that obtained by the rotatable ring 4.

Next, referring to Fig. 7A, a rotatable operation member according to a fifth embodiment of the present invention will be described. Fig. 7A is a plan development view showing an inner peripheral surface of a rotatable ring 54 according to a fifth embodiment of the present invention. The rotatable ring 54 has an annular member 12 and a sheet 51 attached to the inner peripheral surface of the annular member 12. The annular member 12 is the same as the annular member 12 of the above-described first embodiment, and the inner peripheral surface of the annular member 12 is a glossy surface 12a. The detailed description of the annular member 12 is omitted.

The surface of the sheet 51 is a non-glossy surface 51a. In the sheet 51, as in the sheet 11 of the first embodiment described above, the plurality of holes 51b having the width A are formed in parallel at intervals of a width A in the longitudinal direction corresponding to the circumferential direction of the annular member 12. In the case where the sheet 51 is attached to the annular member 12, the gap 12b having the width B is formed between the opposite ends of the annular member 12 in the circumferential direction. The sheet 51 is constructed such that the width B is substantially equal to the width A.

The first convex portion 51c and the second convex portion 51d which protrude in the longitudinal direction are provided on one end surface in the longitudinal direction of the sheet 51. The first convex portion 51c and the second convex portion 51d are disposed at positions where they are not aligned with the plurality of holes 51b in the longitudinal direction of the sheet 51. Specifically, the first convex portion The 51c and the second convex portion 51d are provided at each of both ends in the width direction perpendicular to the longitudinal direction of the sheet 51 (the upper end and the lower end viewed from FIG. 7A), and the hole 51b is provided at the central portion in the width direction. Therefore, the gloss surface 12a itself is exposed to the gap 12b to the same extent as the glossy surface 12a itself is exposed to each of the holes 51b, so that the rotation of the rotatable ring 54 can be detected without hindrance by the light reflectors 10a and 10b. When the sheet 51 is attached to the inner peripheral surface of the annular member 12, both the first convex portion 51c and the second convex portion 51d protrude toward the other end surface of the sheet 51.

The protruding length of the first convex portion 51c is shorter than the width A of the hole 51b and longer than half (A/2) of the width A. The protruding length of the second convex portion 51d is longer than the width A of the hole 51b and shorter than 1.5 times the width A. Therefore, when the sheet 51 is attached to the inner peripheral surface of the annular member 12, the first convex portion 51c does not overlap with the other end surface of the sheet 51 that faces the first convex portion 51c in the circumferential direction, but The two convex portions 51d overlap with the other end surface of the sheet 51 that faces the second convex portion 51d in the circumferential direction.

The first convex portion 51c and the second convex portion 51d are marks for determining whether or not the sheet 51 has been properly mounted to the inner circumferential surface of the annular member 12. For example, when the first convex portion 51c overlaps the end portion of the sheet 51 opposite to the first convex portion 51c, this means that a part of the sheet 51 does not fall on the inner peripheral surface of the annular member 12, and the sheet The width B of the gap 12b between the both ends of the 51 is narrower than the width A of the hole 51b formed in the sheet 51. In this case, since the rotation angle and the rotation direction of the rotatable ring 54 may not be correctly detected, the sheet 51 must be remounted.

On the other hand, when the second convex portion 51d is not in contact with the sheet 51 When the opposite ends of the second convex portion 51d overlap, this means that the sheet 51 is twisted on the inner circumferential surface of the annular member 12, and the width B of the gap 12b between both ends of the sheet 51 is formed on the sheet The width 51 of the hole 51b of 51 is wide. In this case as well, since the rotation angle and the rotation direction of the rotatable ring 54 may not be correctly detected, the sheet 51 must be remounted.

The rotatable ring 54 achieves the same effect as that obtained by the rotatable ring 4, and determines in a simple manner whether the sheet 51 is installed as specified.

It should be noted that the protruding lengths of the first convex portion 51c and the second convex portion 51d are determined within the above range in consideration of variations in components such as dimensional errors and the like. Specifically, when the variation of the component such as the dimensional error or the like is large, the width B of the gap 12b formed between the both ends in the longitudinal direction of the sheet 51 needs to be as close as possible to the width A of the hole 51b. That is, the protruding lengths of the first convex portion 51c and the second convex portion 51d need to be close to the width A. In this case, the amount of acceptable misalignment of the mounted sheet 51 is small.

On the other hand, when the variation of the component such as the dimensional error or the like is small, even if there is a certain difference between the width B of the gap 12b formed between the both ends in the longitudinal direction of the sheet 51 and the width A of the hole 51b, The phase difference between the waveform signals output from the photo reflector can be made to fall within such an acceptable range that no false detection occurs. As a result, the length of the first convex portion 51c is close to half the width A of the hole 51b, and the length of the second convex portion 51d is close to 1.5 times the width A. In this case, the amount of acceptable misalignment of the mounted sheet 51 is large.

The same convex portions as the first convex portion 51c and the second convex portion 51d may be provided to the sheets 21, 31, and 41 explained with reference to FIGS. 6A, 6B, and 6C. Although the first convex portion 51c and the second convex portion 51d are formed on one end surface in the longitudinal direction of the sheet 51 in the rotatable ring 54, this is not limitative, but the first convex portion 51c may be formed. On one end face, the second convex portion 51d may be formed on the other end surface. In this case, the first convex portion 51c and the second convex portion 51d are disposed so as not to overlap each other in the circumferential direction of the annular member 12. Moreover, as the shiny and non-glossy faces of the rotatable ring 24 are opposite the shiny and non-glossy faces of the rotatable ring 4, the shiny and non-glossy faces of the rotatable ring 54 can also be reversed.

Next, referring to Fig. 7B, a rotatable operation member according to a sixth embodiment of the present invention will be described. Fig. 7B is a plan development view showing an inner peripheral surface of the rotatable ring 64 according to the sixth embodiment of the present invention. The rotatable ring 64 has an annular member 62 and a sheet 11 attached to the inner peripheral surface of the annular member 62. The sheet 11 is the same as the sheet 11 of the above-described first embodiment, and therefore detailed description of the sheet 11 will be omitted. In the case where the sheet 11 is attached to the inner peripheral surface of the annular member 62, a gap 62b having a predetermined width B is formed between both ends in the longitudinal direction of the sheet 11.

The inner peripheral surface of the annular member 62 is a shiny surface 62a like the shiny surface 12a of the annular member 12. The first mark 62c and the second mark 62d are formed on the inner circumferential surface of the annular member 62. Referring to FIG. 7B, the first mark 62c and the second mark 62d have a rectangular shape, but this is not limitative. The first mark 62c and the second mark 62d are, for example, recesses formed in the annular member 62, but this is not limitative and can be printed or printed The first mark 62c and the second mark 62d are formed by applying a seal or by attaching a seal. Further, the first mark 62c and the second mark 62d may be convex portions formed on the annular member 62.

The first mark 62c and the second mark 62d are disposed at positions where the first mark 62c and the second mark 62d are not aligned with the plurality of holes 11b in the circumferential direction of the annular member 62. Specifically, the first mark 62c and the second mark 62d are disposed to be close to the corresponding ends of the both ends (the upper end and the lower end seen from FIG. 7B) in the width direction of the sheet 11 attached to the annular member 62. Therefore, the extent to which the glossy surface 62a itself is exposed to the gap 62b is the same as the extent that the glossy surface 62a itself is exposed to each of the holes 11b, and thus the rotation of the rotatable ring 64 can be detected without hindrance by the light reflectors 10a and 10b.

In the circumferential direction of the annular member 62, the length (width) of the first mark 62c is shorter than the width A of the hole 11b formed in the sheet 11 and longer than half (A/2) of the width A. In the circumferential direction of the annular member 62, the length (width) of the second mark 62d is longer than the width A of the hole 11b and shorter than 1.5 times the width A. For this reason, in the case where the sheet 11 is attached to the inner peripheral surface of the annular member 62, the first mark 62c does not overlap the sheet 11 (the first mark 62c is not covered by the sheet 11), but the second mark 62d overlaps the sheet The material 11 (the second mark 62d is partially covered by the sheet 11).

It should be noted that in the present embodiment, the first mark 62c and the second mark 62d are formed on the annular member 62 such that the center of the circumferential direction of the first mark 62c and the second mark 62d is located in the thrust direction with the annular member 62. Parallel straight lines M. However, the first mark 62c is formed The position of the second mark 62d and the second mark 62d are not limited thereto. At least the first mark 62c only has to be formed at a position covered by the second mark 62d as seen from the thrust direction of the annular member 62.

The first mark 62c and the second mark 62d are marks for determining whether the sheet 11 has been properly mounted to the inner peripheral surface of the annular member 62, and the first mark 62c and the second mark 62d are also used for mounting the sheet 11 A mark on the inner circumferential surface of the annular member 62. For example, when the first mark 62c overlaps the end portion of the sheet 11 in the longitudinal direction, this means that the sheet 11 is not disposed on the annular member 62. At this time, the width B of the gap 62b is narrower than the width A of the hole 11b formed in the sheet 11. In this case, since the rotation angle and the rotation direction of the rotatable ring 64 may not be correctly detected, the sheet 11 must be remounted.

On the other hand, when the second mark 62d does not overlap the end portion of the sheet 11 in the longitudinal direction, this means that the sheet 11 attached to the inner peripheral surface of the annular member 62 is twisted, and the width B ratio of the gap 62b is The width A of the hole 11b formed in the sheet 11 is wide. In this case, since the rotation angle and the rotation direction of the rotatable ring 64 may not be correctly detected, the sheet 11 must be remounted.

It should be noted that the length (width) of the first mark 62c and the second mark 62d in the circumferential direction of the annular member 62 is determined as the protruding lengths of the first convex portion 51c and the second convex portion 51d as described above. Such a range considering changes in components such as dimensional errors and the like.

In the present embodiment, the first mark 62c and the second mark 62d are provided at a width in which the sheet 11 is attached to the annular member 62 in the thrust direction. Although not restrictive, the first mark 62c and the second mark 62d may also be disposed at positions on the annular member 62 displaced in the thrust direction.

As described above, the rotatable ring 64 also achieves the same effect as that obtained by the rotatable ring 4, and determines in a simple manner whether the sheet 11 is installed as specified.

It should be noted that the rotatable ring 64 may be constructed such that the sheet 31 for the rotatable ring 24 is mounted to the inner peripheral surface of the annular member 62. The rotatable ring may be constructed such that the first mark 62c and the second mark 62d are formed on the inner peripheral surface of the annular member 62 formed as a non-glossy surface, and the sheet 21 or 41 is mounted inside the annular member 62. Weekly.

In the above embodiment, a rotatable operation member is used in which surfaces having different reflectances are alternately disposed in the circumferential direction on the inner peripheral surface of one curved surface as the annular member. However, the present invention is not limited thereto, and the present invention is also applicable to a rotatable operation member in which surfaces having different reflectances are alternately disposed in a circumferential direction as an annular member or a cylindrical shape The outer peripheral wall surface of the curved surface of the member.

While the invention has been described with reference to exemplary embodiments thereof, it is understood that the invention is not limited to the disclosed exemplary embodiments. The scope of patent application shall be in accordance with the broadest interpretation to include all such modifications, equivalent structures and functions.

The present application claims the priority of Japanese Patent Application No. 2014-243242, filed on Dec. 1, 2014, and Japanese Patent Application No. 2015-179613, filed on Sep. The entire content is hereby incorporated by reference.

10a, 10b‧‧‧Light reflector

11‧‧‧Sheet

11a‧‧‧Non-glossy surface

11b‧‧‧ hole

12‧‧‧Annual members

12a‧‧‧Glossy face

12b‧‧‧ gap

A, B‧‧‧Width

Claims (16)

A rotatable operating member comprising: a member constructed to have a circumferential surface; and a sheet constructed to be fixed to the peripheral surface, wherein a reflectance of a surface of the sheet and a portion of the member The reflectance of the circumferential surface is different, wherein the sheet has a plurality of holes formed side by side in the circumferential direction of the circumferential surface, wherein in the sheet, a part of the peripheral surface is exposed from the hole, The sheet is fixed to the peripheral surface such that both ends of the sheet are opposed to each other in the circumferential direction, and has a width substantially equal to the width of the hole in the circumferential direction in the circumferential direction A gap of width is disposed between the ends of the sheet. The rotatable operating member according to claim 1, wherein a reflectance of the surface of the sheet is lower than a reflectance of the peripheral surface of the member. The rotatable operating member according to claim 1, wherein a reflectance of the surface of the sheet is higher than a reflectance of the peripheral surface of the member. The rotatable operating member according to claim 1, wherein the sheet has a first convex portion and a second convex portion that protrude from one end of the sheet toward the other end of the sheet, The first convex portion and the second convex portion are not in the circumferential direction The plurality of holes are aligned, a protruding length of the first convex portion is shorter than a width of the gap in the circumferential direction, a protruding length of the second convex portion is longer than a width of the gap in the circumferential direction, and The sheet is fixed to the circumferential surface such that the first convex portion does not overlap with the other end of the sheet, and the second convex portion overlaps with the other end of the sheet . The rotatable operating member according to claim 1, wherein: the first mark and the second mark are formed in the gap of the circumferential surface, the first mark and the second mark are in the The circumferential direction is not aligned with the plurality of holes, the width of the first mark in the circumferential direction is shorter than the width of the gap in the circumferential direction, and the width ratio of the second mark in the circumferential direction The gap is long in the circumferential direction, and the sheet is not overlapped with both ends of the sheet with the first mark, and the second mark overlaps both ends of the sheet The method is fixed to the circumferential surface. A rotatable operating member comprising: a member constructed to have a circumferential surface; and a sheet configured to be fixed to the peripheral surface, wherein the sheet includes a first reflective region having a first reflectivity with a second reflective region having a second reflectivity, wherein a difference between a reflectance of the peripheral surface and the second reflectance is smaller than a difference between the first reflectance and the second reflectance, Wherein the sheet is alternately disposed on the circumferential surface in the circumferential direction with the first reflective area and the second reflective area, and both ends of the sheet are fixed in a mutually opposing manner in the circumferential direction In the circumferential surface, a gap having a width in the circumferential direction substantially equal to a width of the second reflective region in the circumferential direction is disposed between both ends of the sheet, and wherein the A gap is sandwiched between the first reflective regions of the sheet. The rotatable operating member according to claim 6, wherein the first reflectance is higher than the second reflectance. The rotatable operating member of claim 6, wherein the first reflectance is lower than the second reflectance. An electronic device comprising: a member constructed to have a circumferential surface; a sheet configured to be fixed to the peripheral surface; and an output unit configured to project light toward the sheet and receive the sheet Light reflected on the material and based on the received light output signal, wherein the reflectivity of the surface of the sheet is different from the reflectivity of the peripheral surface of the member, wherein the sheet has a circumferential surface a plurality of holes formed side by side in the circumferential direction, Wherein in the sheet, a part of the peripheral surface is exposed from the hole, and the sheet is fixed to the peripheral surface in such a manner that both ends of the sheet are opposed to each other in the circumferential direction, and A gap having a width in the circumferential direction substantially equal to a width of the hole in the circumferential direction is provided between both ends of the sheet. The electronic device according to claim 9, wherein a reflectance of the surface of the sheet is lower than a reflectance of the peripheral surface of the member. The electronic device according to claim 9, wherein a reflectance of the surface of the sheet is higher than a reflectance of the peripheral surface of the member. The electronic device according to claim 9, wherein the sheet has a first convex portion and a second convex portion that protrude from one end of the sheet toward the other end of the sheet, the a convex portion and the second convex portion are not aligned with the plurality of holes in the circumferential direction, and a protruding length of the first convex portion is shorter than a width of the gap in the circumferential direction, the second a protruding length of the convex portion is longer than a width of the gap in the circumferential direction, and the sheet is not overlapped with the other end of the sheet with the first convex portion, and the second convex portion The peripheral surface is fixed to overlap with the other end of the sheet. The electronic device of claim 9, wherein: the first mark and the second mark are formed in the gap of the circumferential surface, the first mark and the second mark being in the circumferential direction Not aligned with the plurality of holes, the width of the first mark in the circumferential direction is shorter than the width of the gap in the circumferential direction, and the width of the second mark in the circumferential direction is greater than the gap The width in the circumferential direction is long, and the sheet is fixed in such a manner that the first mark does not overlap the both ends of the sheet, and the second mark overlaps both ends of the sheet The circumferential surface. An electronic device comprising: a member constructed to have a circumferential surface; and a sheet configured to be fixed to the peripheral surface, an output unit configured to project light toward the sheet and receive the sheet Light reflected on the material and based on the received light output signal, wherein the sheet comprises a first reflective area having a first reflectivity and a second reflective area having a second reflectivity, wherein the reflectivity of the peripheral surface a difference between the second reflectance and the second reflectance is smaller than a difference between the first reflectance and the second reflectance, wherein the sheet is in the first reflective region and the second reflective region Alternately disposed on the circumferential surface in the circumferential direction, and both ends of the sheet are fixed to the circumferential surface in a circumferential direction opposite to each other, A gap having a width in the circumferential direction substantially equal to a width of the second reflection region in the circumferential direction is disposed between both ends of the sheet, and wherein the gap is sandwiched between Between the first reflective regions of the sheet. The electronic device of claim 14, wherein the first reflectance is higher than the second reflectance. The electronic device of claim 14, wherein the first reflectance is lower than the second reflectance.