JP6261496B2 - Assembly structure for analog watches for vehicles - Google Patents

Description

  The present invention relates to an assembly structure of an in-vehicle analog timepiece in which a timepiece pointer is indirectly illuminated.

  The applicant of the present application has proposed an in-vehicle analog timepiece that illuminates the timepiece hands and dial using a light emitting device (Patent Document 1). Recently, a device using an LED for the light emitting device is known.

No. 7-47759

  A vehicle-mounted analog timepiece using the above-described LED generally has an LED disposed at the outer peripheral end (lookback) of the dial and projects light onto the central portion of the dial.

  In such a conventional on-vehicle analog timepiece, a pointer or dial is projected from the outer peripheral side, so that the brightness of the illuminated part may vary depending on the place.

  The present invention has been made in view of the above circumstances, and by using an LED and interposing a light guide plate to indirectly illuminate a pointer or the like, the luminance of the illuminated portion is averaged as much as possible. The present invention proposes an assembly structure of an in-vehicle analog timepiece that can be used.

When the invention described in the first claim of the present application is described with the reference numerals used in the embodiments, in the in-vehicle analog timepiece 1 installed in the passenger compartment,
In the space between the front case 2 provided with the glass plate 3 and the back case 4, the movement 5, the circuit board 6, the light guide plate 8, the circular dial 9, and the hour / minute hands are sequentially arranged from the back case side. Provided with pointers 10 and 10,
A plurality of LEDs 7 and 7 that irradiate light toward the light guide plate 8 are arranged on the circuit board 6.
The light guide plate 8 includes an introduction portion 8a that introduces light from the LEDs 7 and 7 into the light guide plate, a disc-shaped main body portion 8c, and a ring-shaped protrusion portion 8b that is located on the periphery of the dial plate 9 and protrudes to the front side. And
The disc-shaped main body portion 8c of the light guide plate 8 and the pointers 10 and 10 are provided in parallel,
A reflector 18 is provided on the circuit board 6 at a location facing the light guide plate 8;
As the dial plate 9, a non-transmission type that does not transmit light and a transmission type that transmits light are alternatively installed.
The pointer 10 is formed of a reflecting member, and includes a reflecting portion 10a that reflects light to the front side on a side portion of the pointer,
When the LEDs 7 and 7 emit light, the light is introduced from the introduction portion 8a of the light guide plate 8 and led out from the ring-shaped protrusion 8b, whereby the pointer 10 appears to emit light. This is an assembly structure of an in-vehicle analog watch.

    The invention described in claim 2 of the present application is an assembly structure of an in-vehicle analog timepiece according to claim 1, wherein a glass fixing tape 15 is adhered between the glass plate 3 and the back case 4. .

  According to the third aspect of the present invention, in the first aspect, a connector 19 is provided on the back surface of the circuit board 6, and a dust prevention cushion 16 is wound around the connector 19 so that the back case 4 and the connector 19 are wound. Is a structure for assembling an analog timepiece for vehicle use, in which a gap 16 is shielded by the dust prevention cushion 16.

According to the invention described in the first claim of the present application, light is emitted from the LEDs 7 and 7 provided on the circuit board 6 toward the light guide plate 8, and this light is introduced into the introduction portion 8a of the light guide plate 8, The light is led out from the ring-shaped projecting portion 8b and reflected by the reflecting portion 10a of the pointer 10 to the front side, and the light led out from the ring-shaped projecting portion 8b also illuminates the dial 9. In this way, the pointer and dial are indirectly illuminated. And since this indirect illumination is performed with the light derived | led-out from the ring-shaped protrusion part 8b of the light-guide plate 8, it is made uniformly from the periphery of the dial plate 9, and averages the brightness | luminance of the location illuminated as much as possible. It is possible to improve visibility. Further, since the reflection plate 18 is provided on the circuit board 6 at a position facing the light guide plate 8, light leaking from the light guide plate 8 is reflected by the reflection plate 18 and introduced again into the light guide plate 8. It is possible to reduce the loss of the amount of light guided in the optical plate 8 as much as possible. In addition, the pointer 10 is formed of a reflective member, and the side portion of the pointer is provided with a reflecting portion 10a that reflects light to the front side. Therefore, the reflecting portion 10a reflects light to the front side, Since the pointer appears to emit light, the illumination level can be improved.

  Further, when a non-transmission type dial that does not transmit light is used for the dial plate 9, the dial plate 9 and the pointer 10 are indirectly illuminated by light derived from the ring-shaped protrusion 8 b of the light guide plate 8.

  Further, when a transmissive type that transmits light is used for the dial plate 9, the pointer 10 is indirectly illuminated by the light derived from the ring-shaped protruding portion 8 b of the light guide plate 8, while the dial 9 The direct illumination from the light guide plate 8 can be performed directly. In this way, when the dial plate 9 can be directly illuminated from the light guide plate 8, for example, a portion corresponding to the index of the dial plate can be transmitted and illuminated with an appropriate color, and the other portions are printed in black. By covering with, it becomes possible to make the indicator stand out more.

  According to the second aspect of the present invention, since the glass fixing tape 15 is adhered between the glass plate 3 and the back case 4, the glass plate 3 and the back case in an in-vehicle analog timepiece having a lot of vibration. 4 can be held. Further, this tape has the effect of a so-called security tape. In other words, the glass plate 3 is removed so that the pointers are not altered, and if the glass plate 3 is removed, the fact can be easily grasped by the trace of the tape. Is.

  According to the invention described in claim 3 of the present application, the dust prevention cushion 16 is wrapped around the connector 19 and the gap between the back case 4 and the connector 19 is shielded by the dust prevention cushion 16. Intrusion of dust from the back case 4 can be sealed. Further, since contact between the back case 4 and the connector 19 can be avoided by the dust prevention cushion 16, it is possible to prevent wear of members and generation of noise due to these contacts.

  As described above, according to the present invention, the luminance of the illuminated portion can be averaged as much as possible by indirectly illuminating the pointer with the light guide plate interposed in the LED. Improvements can be made. In addition, by selecting the non-transmission type or the transmission type for the dial plate alone, the indirect illumination method and the indirect illumination method with transmission illumination can be used without changing the basic light guide structure. The two methods can be realized as appropriate.

1 is a front view of an in-vehicle analog timepiece according to an embodiment of the present invention. FIG. 2 is a sectional view taken along line XX in FIG. 1 according to the embodiment of the present invention. 1 is an exploded perspective view of an in-vehicle analog timepiece according to an embodiment of the present invention. It is a figure which shows the circuit board concerning the Example of this invention. It is a principal part sectional view of an in-vehicle analog timepiece concerning an example of the present invention. It is a front view at the time of illumination of the vehicle-mounted analog timepiece according to the embodiment of the present invention. FIG. 10 is a cross-sectional view of a main part showing another example of the in-vehicle analog timepiece according to the embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an in-vehicle analog timepiece showing a glass plate according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an in-vehicle analog timepiece showing a glass plate and a back case according to an embodiment of the present invention. It is a longitudinal cross-sectional view of the vehicle-mounted analog timepiece which shows the part of a glass plate, a lookback, and a back case according to the Example of this invention. It is a figure which concerns on the Example of this invention and shows the glass plate provided with the glass nail | claw. It is a longitudinal cross-sectional view of the vehicle-mounted analog timepiece which shows the part of a circuit board, a connector, and a back case concerning the Example of this invention. 1 is a rear view of an in-vehicle analog timepiece according to an embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the in-vehicle analog timepiece 1 of this example includes a movement 5, in order from the back case side, in a space between the front case 2 provided with the glass plate 3 and the back case 4. A circuit board 6, a light guide plate 8, a circular dial plate 9, hands 10 and 10 such as an hour / minute hand, and a turn 13 are provided.

  A plurality of LEDs 7, 7 that irradiate light toward the light guide plate 8 are arranged on the circuit board 6. In this example, as shown in FIG. 4, four LEDs 7 and 7 are equally arranged in the center of the circuit board.

  The light guide plate 8 includes an introduction portion 8a that introduces light from the LEDs 7 and 7 into the light guide plate, and a ring-shaped protrusion portion 8b that is located at the periphery of the dial plate 9 and protrudes to the front side. In this example, the dial 9 is of a non-transmissive type that does not transmit light. In the figure, reference numeral 8 d denotes a leg portion of the light guide plate 8. The leg portion 8d is positioned by being inserted through the notch portion of the circuit board 6, and then fixed by a tapping screw 17 (see FIG. 3) inserted from the back surface of the back case 4.

  In the light guide plate 8, light introduced from the introduction portion 8a of the light guide plate 8 by light guide means (not shown) is emitted from the ring-shaped protrusion 8b.

  The pointer 10 is formed of a reflective member, and includes a reflecting portion 10a that reflects light toward the front side on the side portion of the pointer. When the reflection portion 10a is provided in this way, light is reflected to the front side by the reflection portion 10a and the pointer appears to emit light, so that the illumination intensity can be improved.

  In the in-vehicle analog timepiece 1 of the present example configured as described above, when the LEDs 7 and 7 emit light, the light is introduced from the introduction portion 8a of the light guide plate 8 and led out from the ring-shaped protrusion 8b, thereby the pointer. The light is reflected by the 10 reflecting portions 10a, and the pointer appears to emit light. In this example, the four LEDs 7 and 7 are evenly arranged in the center of the circuit board. However, when the in-vehicle analog timepiece 1 is relatively small, the number is smaller than this, for example, two LEDs 7 and 7 are used. There may be.

  In the in-vehicle analog timepiece 1 of this example, the dial 9 is of a non-transmissive type that does not transmit light. Therefore, both the pointer 10 and the dial plate 9 are indirectly illuminated with light derived from the ring-shaped protrusion 8b of the light guide plate 8.

  In this case, the dial 9 can be easily fixed by interposing a double-sided tape between the dial 9 and the light guide plate 8, for example. Therefore, the dial holder 11 described later need not be used.

  On the other hand, the thing shown in FIG. 7 uses the transmission type thing which passes light for the dial plate 9. In this case, the pointer 10 can be indirectly illuminated by the light derived from the ring-shaped protrusion 8 b of the light guide plate 8, while the dial 9 can be directly illuminated from the light guide plate 8. In this way, when the dial plate 9 can be directly illuminated from the light guide plate 8, for example, a portion corresponding to the index of the dial plate can be transmitted and illuminated with an appropriate color, and the other portions are printed in black. By covering with, it becomes possible to make the indicator stand out more.

  Further, in the case of the example shown in FIG. 7, a reflecting plate 18 is provided on the circuit board 6 at a location facing the light guide plate 8. When the reflection plate 18 is provided in this way, the light leaking from the light guide plate 8 is reflected by the reflection plate 18 and introduced again into the light guide plate 8, and the loss of the light guide amount in the light guide plate 8 is minimized. It becomes possible to reduce.

  The reflection plate 18 may be provided not only on the circuit board 6 described above, but also on the side of the light guide plate 8 facing the dial plate 9 and other appropriate locations.

  Therefore, by selecting a non-transmission type or a transmission type for the dial plate 9 without changing the basic light guiding structure, an indirect illumination method and a method in which transmitted illumination is added to indirect illumination. Two systems can be realized as appropriate.

  In the examples shown in FIGS. 3 and 7, reference numeral 11 denotes a dial presser for fixing the dial 9 to the light guide plate 8. The dial holder 11 is provided with four bosses 11a at the bottom. The boss 11a is fused to the disc-shaped main body portion 8c of the light guide plate 8 by heat or ultrasonic waves. In this way, the boss 11a is fused with, for example, the boss 11a instead of the claw, so that there is a problem that the fixing strength is slightly weak or the light is irregularly reflected at the claw. This is to avoid it.

  Further, in FIG. 3, reference numeral 12 denotes a center cap, which externally holds and holds a pointer shaft inserted through the disc-shaped main body portion 8 c of the light guide plate 8. In this case, since the shaft is long, the tilt of the pointer 10 fixed to the shaft 10 is suppressed, and the light sources (LEDs 7 and 7) are close to each other.

  In the example shown in FIGS. 8-11, in the figure, 3a is a glass nail | claw and 15 is a glass fixing tape.

  In this example, a glass fixing tape 15 is bonded between the glass plate 3 and the back case 4. A turn 13 is mounted between the glass plate 3 and the back case 4, and the glass fixing tape 15 is easily removed at a plurality of locations between the glass plate 3 and the back case 4 with the turn 13 interposed therebetween. It is provided so that it cannot be done. In this example, the glass fixing tape 15 is bonded so as to be L-shaped in a side view. The glass plate 3 is provided with a plurality of glass claws 3a in a circumferential shape. The glass claw 3 a is engaged with the back case 4.

  As described above, the in-vehicle analog timepiece 1 of this example has a movement 5, a circuit board 6, a light guide plate 8, a circular shape in the space between the front case 2 and the back case 4 in order from the back case side. It is formed by incorporating a dial plate 9, hands 10 and 10 such as an hour and minute hands, and a turn 13. Therefore, the built-in analog timepiece 1 mounted on the vehicle is structurally configured to be removable, for example, to change the front case 2 to another colored one.

  In the case of this example, as described above, the glass fixing tape 15 is adhered between the glass plate 3 and the back case 4, so that the glass plate 3 and the back case are mounted in an analog watch for in-vehicle use with a lot of vibration. 4 can be held. Further, this tape has the effect of a so-called security tape. This prevents the glass plate 3 from being removed and the pointers from being altered, and if the glass plate 3 is removed, the fact can be easily grasped by the trace of the tape. become.

  As shown in FIGS. 3, 12, and 13, a connector 19 is provided on the back surface of the circuit board 6, and a dust prevention cushion 16 is wrapped around the connector 19, and the back case 4, the connector 19, Is covered with the dust prevention cushion 16.

  In this example, the dust prevention cushion 16 is wrapped around the connector 19 and the gap between the back case 4 and the connector 19 is shielded by the dust prevention cushion 16. It can be sealed. Further, since contact between the back case 4 and the connector 19 can be avoided by the dust prevention cushion 16, it is possible to prevent wear of members and generation of noise due to these contacts.

  The in-vehicle analog timepiece assembling structure of the present invention can average the luminance of the illuminated portion as much as possible by indirectly illuminating the hands and the like, and can be suitably used for all types of vehicles. it can.

DESCRIPTION OF SYMBOLS 1 In-vehicle analog clock 2 Front case 3 Glass plate 3a Glass nail 4 Back case 5 Movement 6 Circuit board 7 LED
8 Light guide plate 8a Introducing portion 8b Ring-shaped projecting portion 8c Disk-shaped main body portion 8d Leg portion 9 Dial plate 10 Pointer 10a Reflecting portion 11 Dial retainer 11a Boss 12 Center cap 13 Turning 15 Glass fixing tape 16 Dust prevention cushion 17 Tapping screw 18 Reflector 19 Connector

Claims (3)

In the in-vehicle analog watch installed in the passenger compartment,
In the space between the front case with the glass plate and the back case, in order from the back case side, equipped with movement, circuit board, light guide plate, circular dial, and hands such as hour and minute hands,
A plurality of LEDs that irradiate light toward the light guide plate are disposed on the circuit board,
The light guide plate includes an introduction portion that introduces light from the LED into the light guide plate, a disk-shaped main body portion, and a ring-shaped protrusion portion that is located on the periphery of the dial plate and protrudes to the front side,
The disk-shaped main body of the light guide plate and the pointer are provided in parallel,
A reflector is provided on the circuit board at a location facing the light guide plate,
The dial is selectively installed between a non-transmission type that does not transmit light and a transmission type that transmits light.
The pointer is formed of a reflective member, and a side portion of the pointer includes a reflection portion that reflects light to the front side.
When the LED emits light, the light is introduced from the introduction portion of the light guide plate and led out from the ring-shaped protruding portion, whereby the pointer is configured to appear to emit light. Assembly structure for analog watches.   The assembly structure of the analog timepiece for vehicles according to claim 1, wherein a glass fixing tape is adhered between the glass plate and the back case. A connector is provided on a back surface of the circuit board, and a dust prevention cushion is wound around the connector, and a gap between the back case and the connector is shielded by the dust prevention cushion. 1 is an assembly structure of an in-vehicle analog timepiece.

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