JP4363992B2 - Operation knob device - Google Patents

Description

  The present invention relates to an operation knob device, and more particularly to an operation knob device disposed on a front operation panel of a heating appliance such as a table stove.

Conventionally, a light source is provided on the back side of an operation knob device that penetrates through an opening provided in the operation panel, and the light source is turned on in response to an on / off operation or a rotation operation by the operation knob, and the knob or its outer periphery is translucent. A device that illuminates the front surface of an operation panel through a gap is known (for example, see Patent Document 1). As described above, when the operation panel having the illumination function is provided on the knob or the outer periphery of the knob using the backlight as the light source, it is possible to visually recognize whether or not the heater corresponding to the operation knob is activated. This lighting function is particularly convenient for cooking utensils equipped with a plurality of heating utensils because it is easy to confirm which heating utensil of the plurality of heating utensils is being used. It is also useful for improving the design properties.
Japanese Utility Model Publication No. 58-186301 (Figs. 2-4)

  By the way, when the outer periphery of the operation knob is used as the illumination portion, it is desired to keep the brightness uniformly over the entire periphery. For this reason, in Patent Document 1, in the first mode shown in FIG. 2 and the second mode shown in FIG. 3, a plurality of light sources are arranged in the vertical position. However, there is a limit to the space that can be secured on the back of the operation panel. In particular, when a variable resistor for adjusting the amount of light is connected to the light source as shown in FIG. Because of this limitation, some of the multiple light sources may have to be sacrificed. As a result, the desired constant luminance cannot be obtained over the entire outer periphery of the knob, and the luminance may be uneven.

  In view of the above problems, an object of the present invention is to provide an operation knob device capable of obtaining sufficient brightness over the entire circumference of the knob outer periphery.

In order to solve the above-described problems, the operation knob device of the present invention includes an opening provided in the operation panel, and a light turbulent reflecting portion by providing knurls or fine irregularities on the inner peripheral side or the inner peripheral side and the outer peripheral side. A cylindrical body made of a light-transmitting material , and a peripheral wall part that surrounds the cylindrical body and is provided with a notch in the upper back side portion and has an inner peripheral surface facing the outer periphery of the cylindrical body as a reflector A knob case, and an outer periphery of the cylindrical body and an inner peripheral surface of the knob case, so that light can be repeatedly reflected at the back of the operation panel via the notch. A light source that illuminates from the back toward the cylinder on the operation panel side is provided.

  According to this, the light-transmitting outer peripheral portion of the cylindrical body is irradiated by light emission of the light source, and the irradiation light reflected by the light-transmitting outer peripheral portion is further reflected by the reflector on the inner peripheral surface of the peripheral wall portion of the knob case, and again The translucent outer periphery of the cylinder is irradiated. Thereby, the irradiation light re-irradiated to the translucent outer peripheral part of the cylinder is irregularly reflected by the light irregular reflection part of the cylinder and increases brightness.

  As described above, since the peripheral wall portion is formed so as to surround the cylindrical body, the reflection at the translucent outer peripheral portion of the cylindrical body described above → the reflection at the inner peripheral surface of the peripheral wall portion → the translucent light of the cylindrical body. The cycle of re-reflection due to reflection at the outer peripheral part → re-reflection at the reflector on the inner peripheral surface of the peripheral wall is repeated over the entire circumference of the cylinder, and the propagation of the irradiation light is the entire circumference of the outer circumference of the cylinder. Uniformly. Moreover, this irradiation light is diffusely reflected by the light irregular reflection part provided in the translucent outer peripheral part, and obtains shine. For this reason, even if the number of backlight light sources is minimal, sufficient luminance can be uniformly obtained over the entire circumference of the cylindrical body corresponding to the outer circumference of the knob, and an increase in brightness can be obtained in the light diffuse reflection part. Thus, it is possible to effectively check the presence or absence of operation. In addition, if the light irregular reflection part is formed in the irradiation surface, it will change into not only simple reflected light but congested irregular reflected light, and propagation to all the circumferences will be performed effectively.

  The light irregular reflection portion may be provided on the outer side or the inner side of the outer peripheral portion of the cylindrical body. Therefore, it is possible to make appropriate changes, such as providing only on the inner side for the purpose of preventing contamination, or providing light diffuse reflection portions on both the inner and outer sides to increase the diffuse reflection effect. In addition, as the light irregular reflection portion, a “wrinkle” made of fine irregularities such as a knurled or satin-like shape can be adopted.

  In addition, when the above-described cylindrical body has a cylindrical outer peripheral portion made of a light-transmitting cylindrical body and a solid portion penetrating therein, the cylindrical outer peripheral portion and the solid portion Can be operated independently of each other, so that, for example, multi-functions such as point-extinguishing the heating appliance by pushing the solid part, and adjusting the heating power of the heating appliance by turning the cylinder outer periphery Conveniently can be equipped with.

  And by providing a reflector further inside the translucent outer peripheral portion of this cylindrical body, the irradiation light that has passed through the translucent portion is reflected by the reflector and is reflected again by the reflector of the case. Overlapping irradiation light reflection by repetition is performed. For this reason, the propagation of the irradiation light is maintained without the irradiation light being absorbed or attenuated by the solid portion located further inside the outer peripheral portion of the cylindrical body, that is, for example, the point extinguishing button. Therefore, the illumination function by this becomes a thing of a more uniform and high-intensity over the perimeter of the translucent outer peripheral part of a cylinder.

  In this case, the above-described reflector is assumed to be a cylindrical body, and the front end portion of the outer peripheral portion of the cylindrical body has an internal / external double structure that is folded so that both the inner and outer sides of the distal end portion of the reflective cylindrical body are sandwiched. By forming, the sealing performance with respect to the reflective cylinder is improved. That is, when the reflective cylinder is provided inside the outer periphery of the cylinder, a gap is generated at a contact portion between different constituent members, and boiled juice spilled during cooking may enter the inside through this gap. And if the broth remaining inside adheres to the translucent body as dirt, a problem of reduced reflection effect arises. On the other hand, since the intrusion of spilled juice is effectively suppressed by housing the reflective cylinder with the above-described inner / outer dual structure having high sealing performance, attenuation of the reflection effect can be prevented.

  In addition, by forming openings at the positions of the lower surfaces of the outer peripheral portion of the cylinder and the reflective cylinder, both cylinders are distributed around an opening opened downward, for example, around the axis of both cylinders. The formed quarter-circular arc band-shaped opening is provided. Therefore, even when spilled juice or the like enters the inside, the spilled juice is naturally discharged from the lower surface opening through the inside. In this way, internal residues such as spilled juice can be reliably prevented, which is advantageous not only for the reflection effect but also for maintenance.

  Furthermore, in order to obtain the maximum brightness over the entire circumference of the outer peripheral portion of the cylindrical body made of a translucent material, the irradiation light from the light source is approximately 45 with respect to the irradiation surface of the cylindrical body illuminated by the light source. It is desirable to enter at an angle of 60 °. That is, by setting the relative position between the light source and the irradiation surface so that an angle of approximately 30 ° to 45 ° can be obtained by displaying the incident angle as an angle with respect to the normal to the irradiation surface, A uniform and high brightness illumination function can be obtained efficiently.

  In the operation knob device of the present invention, with respect to the irradiation light from the light source, the reflection at the light diffuse reflection portion and the reflection at the reflector on the inner peripheral surface of the peripheral wall portion are repeatedly performed, and the reflection that continues repeatedly is performed. Since it is performed over the entire circumference of the outer periphery of the cylindrical body made of a translucent body, high brightness and uniform illumination can be obtained over the entire circumference of the cylindrical body corresponding to the outer periphery of the knob, and it is irregularly reflected by the light irregular reflection section. Therefore, it is possible to provide an operation knob device that attracts the operator's attention and is excellent in design.

  FIG. 1 is an external perspective view of a gas built-in stove 1 with a grill. Point fire extinguishing and heating power adjustment of each of the three stove parts 3, 4 and 5 installed on the top plate 2 are performed by pushing the operation knobs 6, 7 and 8 provided on the operation panel 11 (point fire extinguishing) and turning. Perform by operation (thermal power adjustment). The operation knob 9 is for the grill 10. The present invention relates to the operation knobs 6, 7, 8, and 9 and controls the outer peripheral portions 6a, 7a, 8a, and 9a of the operation knobs to light up when the respective burners and grill burners (not shown) are ignited. Device.

  FIG. 2 is a schematic side view of the operation knob device corresponding to the first aspect of the present invention, and includes peripheral wall portions 14a and 14b at the back of the opening 12 formed in the operation panel 11 located on the front surface of the stove. A knob case 15 is provided, and the case 15 surrounds the inner portion of the cylindrical operation knob body 13 with a button. In this installation example, the knob case 15 is made of resin and is formed integrally with the operation panel 11 at the back of the opening 12.

And the notch part 14c which notched the back | inner side part of the upper side peripheral wall part 14b among the surrounding wall parts 14a and 14b in the circumferential direction was formed. The shape of the cutout portion 14c is, for example, an arc range that is distributed about 15 ° to the left and right around the knob rotation axis with the position immediately above the operation knob body 13 as viewed from the front of the operation panel 11 side. The remaining portion of the upper peripheral wall portion 14b includes an inclined surface having a height difference such that the back side is higher than the near side. Then, a light source 16 composed of a light emitting diode element (LED) that illuminates at an angle of about 45 ° with respect to the irradiation surface 21a of the knob body 13 from the cutout portion 14c of the upper peripheral wall portion 14b is attached to the back of the operation panel 11. It was.

  Here, the light source 16 loaded in the light source case 16a is fixed to the back side of the operation panel 11 by attaching the bush 17 provided on the upper portion of the case 16a to the bracket 18 on the operation panel 11 side.

  A light shielding plate 19 extends from the front end of the light source case 16a. On the other hand, the peripheral wall portions 14a and 14b constituting the knob case 15 are formed by covering the inner peripheral surface 14d facing the operation knob body 13 with a reflector such as copper chrome plating.

  Furthermore, the button-equipped operation knob body 13 is loaded with a drum-shaped point-extinguishing button 20 that can be pushed back at a position corresponding to the solid portion of the cylindrical shape, and the periphery thereof is made of, for example, polycarbonate resin or acrylic resin. A translucent material is used to provide a basic structure that is surrounded by a cylindrical outer peripheral portion 21. Then, the heating power adjusting knob portion 22 is covered and integrated with the front end portion of the outer peripheral portion 21, and an interlocking member 23 is attached to the opposite rear end portion, and the claws 21 b (see FIG. 4) of the outer peripheral portion 21. It is locked. A cock connector 24 is attached to the rear end of the point fire button 20. Furthermore, in the translucent outer peripheral portion 21, a knurl 25 (see FIG. 4) having a predetermined pitch is engraved on the irradiation surface 21a of the light source 16 as a light irregular reflection portion on the inner side thereof.

  The detailed structure of the operation knob body 13 with buttons is shown in FIGS. That is, as shown in the exploded perspective view of FIG. 3, the knob body 13 includes, in order from the front, the heating power adjustment knob portion 22, the translucent outer peripheral portion 21, the fire extinguishing button 20, the interlocking member 23, and the cock connection. A body 24 is disposed. Further, as shown in FIG. 4, a gas opening / closing mechanism G having a push-push mechanism is attached to the rear of the knob body 13. Two arms 21c protrude from the outer peripheral portion 21 to the back. Then, by rotating the outer peripheral portion 21, the gear H rotates through the arm 21c, and the throttle portion S inside the gas opening / closing mechanism G is controlled to make the gas amount variable.

  By the way, the button-equipped operation knob body 13 in FIG. 2 shows a state at the time of gas fire extinguishing, and when the button 20 is pushed in, the button 20 and the outer peripheral portion 21 around the button 20 are pushed in via the interlocking member 23. Then, it is locked by the push-push mechanism at the pushing position of the button 20 (see the broken line position of the knob body 13 in FIG. 2), and in this state, the gas valve is kept open, the spark is blown, and the ignition operation is performed. Become. When the button 20 is pressed again in the ignition state, the lock by the push-push mechanism is released, the button 20 returns to the OFF position, and the gas valve closes.

  At this time, since the light source 16 is turned on to indicate the ignition state when the button 20 is in the pushing position, the irradiation surface 21a also moves in the pushing direction in accordance with the pushing stroke of the button 20.

  This is advantageous in that the irradiation surface 21a approaches the light source 16 even in an environment where the arrangement space of the light source 16 is restricted by the back surface portion of the operation knob device. That is, when the operation knob device of the present invention is adopted, a push-push type gas point fire extinguishing mechanism that ignites at the position where the button 20 is pushed as described above is advantageous.

  The irradiation surface 21a also moves in the pushing direction along with the pushing stroke of the button 20 (see the broken line position of the knob body 13 in FIG. 2), but the engraved portion of the knurl 25 (see FIG. 4) is also in the pushing position at the time of use. The setting is made so as to remain at the outer position of the panel operation surface 11. This is because, as will be described later, high brightness is obtained with the knurl 25, and therefore this engraved portion needs to be always looked at the outside position of the panel operation surface 11. If the engraved portion of the knurl 25 is hidden behind the panel operation surface 11, the brightness effect of the translucent outer peripheral portion 21 is significantly reduced.

  FIG. 4 is a cross-sectional view of the button-equipped operation knob body 13 when these components are mounted. As clearly shown in the figure, knurls 25 having a predetermined pitch are engraved over the entire circumference of the translucent outer peripheral portion 21 inside the irradiation surface 21 a.

  When irradiating the light emission from the light source 16 with respect to the irradiation surface 21a, with reference to FIG.2 and FIG.4, first, irradiation light is irradiated to the translucent outer peripheral part 21. FIG. The irradiation light reflected by the translucent outer peripheral portion 21 reaches the reflective inner peripheral surface 14d of the peripheral wall portions 14a and 14b, is reflected here, and irradiates the translucent outer peripheral portion 21 again. At this time, since the peripheral wall portions 14a and 14b are formed so as to surround the operation knob body 13 with a button, reflection at the translucent outer peripheral portion 21 → reflection at the reflective inner peripheral surface 14d → translucent outer peripheral portion The cycle of re-reflection at 21 → re-reflection at the reflective inner peripheral surface 14 d is repeated at random over the entire circumference of the translucent outer peripheral portion 21.

  As a result, the propagation of the irradiation light from the light source 16 is performed uniformly over the entire circumference of the translucent outer peripheral portion 21. Furthermore, the irradiation light propagated at this time is diffusely reflected by the knurling 25 engraved on the irradiation surface 21a to obtain brightness.

  Therefore, even if the number of light sources of the backlight light source 16 is a minimum, uniform condensing with sufficient luminance can be obtained over the entire periphery of the translucent outer peripheral portion 21 corresponding to the outer periphery of the button 20. And the area | region which protruded to the front side of the operation panel 11 from the opening 12 among the irradiation surfaces 21a and the front end surface of the outer peripheral part 21 shone over the perimeter. In particular, the knurl 25 is locally brilliant and the visual recognition effect is enhanced. Further, when the knurl 25 is engraved on the irradiation surface 21a as in the present embodiment, the reflection and re-reflection cycles are effectively performed.

  In addition, when the irradiation light from the light source 16 is incident on the irradiation surface 21a at an angle of about 45 ° to 60 °, that is, the incident angle that is an angle with respect to the normal line of the irradiation surface 21a is about 30 ° to 45 °. In some cases, it has been found that this illumination mechanism obtains the highest brightness. For this reason, the light source 16 in FIG. 2 is arranged at an incident angle position of approximately 45 °.

  FIG. 5 shows an operation knob body 52 with buttons used in the operation knob device according to the second aspect of the present invention. As with the knob body 13 shown in FIG. 2, the main knob body 52 is also inserted into the opening 12 provided in the operation panel 11 located on the front surface of the stove. The operation knob body 52 is illuminated at an incident angle of about 45 ° from the knob case 15 formed by surrounding the portion with the peripheral wall portions 14a and 14b having the peripheral surface 14d of the reflector and the notch portion 14c of the peripheral wall portion 14b. The operation knob device is constituted by the light source 16 composed of a light emitting diode element (LED).

  Referring to FIG. 5, also in operation knob body 52 with buttons, drum-shaped point-extinguishing button 50 that can be pushed back is loaded at a position corresponding to a solid part, and a polycarbonate resin, an acrylic resin, or the like is placed around it. The basic structure is surrounded by the outer peripheral portion 51 formed of the translucent material. An interlocking member 53 is attached to the rear end portion of the outer peripheral portion 51 and is locked by a claw 51c (see FIG. 7) of the outer peripheral portion 51. Further, a reflective cylinder 56 made of a copper chrome plating material was fitted in contact with the inner peripheral surface of the translucent outer peripheral portion 51. Further, a knurl 55a, 55b having a predetermined pitch is engraved on both the inner and outer sides of the bright portion 51a located at the front end portion of the translucent outer peripheral portion 51 over the entire circumference. In FIG. 5, 55a indicates an inner knurl and 55b indicates an outer knurl. In particular, the outer knurl 55b also serves as a non-slip function of the heating power adjustment knob.

  Next, the detailed structure of the button-equipped operation knob body 52 is shown in FIGS. As shown in the exploded perspective view of FIG. 6, the main knob body 52 includes, in order from the front, a translucent outer peripheral portion 51 that also serves as a heating power adjustment knob, a reflective cylinder 56, a point-extinguishing button 50, and an interlocking member 53. , And the cock connector 54 are connected. In addition, the point which the gas opening / closing mechanism provided with the push-push mechanism by the biasing spring mechanism etc. outside a figure attaches is the same as that of what is shown in FIG.

  FIG. 7 is a cross-sectional view of the button-equipped operation knob body 52 when these components are mounted. As clearly shown in the drawing, in the translucent outer peripheral portion 51, a knurl 55a is engraved on the inner side and a knurl 55b is engraved on the outer periphery of the outer peripheral portion 51 at a predetermined pitch interval. In addition, a reflective cylindrical body 56 is fitted on the inner peripheral surface of the outer peripheral portion 51 while being in contact with the inner peripheral surface.

  Then, for light emitted from the light source 16, reflection at the outer peripheral portion 51 (see FIG. 7) → reflection at the reflective inner peripheral surface 14d (see FIG. 2) → rereflection at the outer peripheral portion 51 (see FIG. 7) → The cycle of re-reflection on the reflective inner peripheral surface 14d (see FIG. 2) is repeated.

At this time, in the operation knob body with buttons 52 shown in FIG. 7, the reflective cylinder 56 is further fitted to the inner peripheral surface of the outer peripheral portion 51. Irradiation light that has passed through is also reflected by the reflective cylinder 56. Therefore, coupled with the fact that the reflected light is again reflected by the reflective inner peripheral surface 14d after passing through the outer peripheral portion 51, the reflection cycle is performed more effectively. In other words, unlike the first mode, the knob body 52 with buttons of the second mode maintains its reflection and re-reflection without the irradiation light being absorbed or attenuated by the buttons 50. Therefore, high brightness can be obtained uniformly over the entire circumference of the translucent outer peripheral portion 51 by this illumination function. In addition, since the outer peripheral portion 51 is engraved with knurling 55a and 55b, it is irregularly reflected by the knurling 55a and 55b, and as a result, synergistic condensing is performed over the entire circumference of the outer peripheral portion 51. As a result, local brightness is obtained and the visual effect is improved. In the first embodiment also, a light irregular reflection portion such as the knurling 55a and / or 55b can be provided on the irradiation surface. In the first embodiment, a reflector similar to the reflective cylindrical body 56 can be provided.

  As shown in FIG. 7, the front end portion 51b of the translucent outer peripheral portion 51 is formed into an inner / outer double structure that is folded so that the front end portion 56a of the reflective cylindrical body 56 is sandwiched. The reflective cylinder 56 is sealed inside. This is because when the reflective cylinder 56 is fitted only in the contact state, a gap is formed in the contact portion between the translucent outer peripheral portion 51 and the reflective cylinder 56, and the spilled broth or the like is lost during cooking. This is because it may enter the inside through this gap. That is, by housing the reflective cylinder 56 in the inner / outer dual structure with high sealing performance, intrusion of spilled juice and the like is effectively suppressed, and an advantage in reflection effect is obtained.

Further, the button-equipped knob body 52 shown in FIG. 7 is provided with an arc-shaped band-shaped opening 52a on the rear lower surface portion thereof. The opening 52a is formed in the translucent outer peripheral portion 51 and the reflective cylindrical body 56 when fitted to the outer peripheral portion 51 at the lower surface positions of the translucent outer peripheral portion 51 and the reflective cylindrical body 56, respectively. Arc belt-like openings 51d and 56c formed with a circumferential angle of approximately 45 ° each around the axis 57 are formed in communication. That is, the translucent outer peripheral part 51 and the reflective cylinder 56 are communicated, and the quarter-circumferential opening 52a is provided on the lower surface of the knob body 52 with a button. And even if spilled juice or the like enters the inside of the knob body 52, the spilled juice that has passed through the opening 52a is naturally discharged from the arc-shaped opening 52a on the lower surface. The purpose of the installation of the arc-shaped band-shaped opening 52a is to reliably prevent the spilled juice from remaining inside and to obtain not only a reflection effect but also a maintenance advantage.

  In this embodiment, the knurls 55a and 55b are engraved on both the inner and outer sides of the translucent outer peripheral portion 51. However, the knurls may be engraved only on one side. This is because, as long as the outer peripheral portion 51 is formed of a translucent material, irregular reflection of irradiation light can be obtained by the knurl as the light irregular reflection portion. Therefore, it is possible to appropriately change the knurling 55a only on the inner side of the outer peripheral portion 51 for the purpose of preventing contamination, or knurling 55a, 55b on both the inner and outer sides to increase the diffuse reflection effect.

  In both the first and second modes, when the point-extinguishing buttons 20 and 50 are pressed, the outer peripheral portions 21 and 51 are pressed via the interlocking members 23 and 53 to reach the ignition position. And it demonstrated and demonstrated that the outer peripheral parts 21 and 51 were rotated in the ignition position, and throttle operation of gas amount was performed. However, with the configuration excluding the interlocking members 23 and 53, only the point-extinguishing buttons 20 and 50 are moved during the pushing operation, and the outer peripheral portions 21 and 51 are kept stationary and the gas amount at the time of rotation thereof is maintained. It is good also as a function only of aperture operation.

  Further, in this embodiment, the knurls 25, 55a, and 55b are engraved as the light irregular reflection portions. However, instead of the knurls, “wrinkles” made of fine irregularities may be formed.

  The present invention is not limited to cooking utensils, and can be used for an operation panel that requires a high luminance and uniform illumination function even in a limited backlight light source space.

External perspective view of a built-in stove with a grill equipped with an operation knob with buttons Side surface schematic diagram which shows the 1st aspect of the operation knob apparatus of this invention. The exploded perspective view of the operation knob body with a button used for the 1st mode Schematic sectional view of the button-equipped operating knob used in the first embodiment The perspective view of the operation knob body with a button used for the 2nd aspect of the operation knob apparatus of this invention. The exploded perspective view of the operation knob object with a button used for the 2nd mode Schematic cross-sectional view of an operation knob body with buttons used in the second mode

Explanation of symbols

11 Operation panel 6a 7a 8a 9a Outer peripheral part 12 Opening 13 52 Operation knob body (operation button)
14a 14b Perimeter wall portion 14d Reflector inner peripheral surface 15 Knob case 16 Light source 20 50 Point-extinguishing button (solid portion)
21 51 Translucent outer peripheral part (translucent cylindrical body, cylindrical outer peripheral part)
21a Irradiation surface 51b Front end portion 25 55a 55b Knurl (light diffuse reflection part)
56 Reflective cylinder (reflector)
56a Tip portion 51d 56c 52a Circular belt-shaped opening

Claims (5)

And fitted through the opening provided on the operation panel, on the inner peripheral side or the inner circumferential side and outer circumferential side, a cylindrical body formed by transparent material having a light diffuse reflection part by providing knurling or fine irregularities, the A knob case that includes a peripheral wall portion that surrounds the cylindrical body and has a notch in the upper back side portion and has an inner peripheral surface facing the outer periphery of the cylindrical body as a reflector, and the outer peripheral portion of the cylindrical body and the knob A light source that illuminates from the back of the operation panel to the cylinder on the operation panel side through the notch so that light can be repeatedly reflected between the inner peripheral surfaces of the case And an operation knob device characterized by that.   The cylindrical body is configured as a separate body composed of a cylindrical outer peripheral portion made of a translucent cylindrical body and a solid portion penetrating therein, and the cylindrical outer peripheral portion and the solid portion are independent of each other. 2. The operation knob device according to claim 1, wherein the operation knob device comprises a movable operation button.   The reflector is a cylindrical body, and the front end portion of the outer peripheral portion of the cylindrical body is formed into an inner / outer double structure that is folded so as to sandwich both the inner and outer sides of the distal end portion of the reflective cylinder. The operation knob device according to claim 1 or 2.   The operation knob device according to claim 3, wherein an opening is formed in a lower surface position of each of the outer peripheral portion of the cylindrical body and the reflective cylindrical body.   The irradiation light from the light source is incident at an angle of approximately 45 ° to 60 ° with respect to the irradiation surface of the cylinder illuminated by the light source. Operation knob device.

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