JP2015152368A - Timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a timepiece which is different in appearance of notation in the bright environment and the dark environment.SOLUTION: A timepiece includes: hands; light-emitting sources; and a light guide plate 3c which includes a peripheral part 32c to which light diffusion processing for diffusing light from the light-emitting sources is applied, which also includes notation parts 34c surrounded by the peripheral part 32c while the light diffusion processing is not applied thereto and representing numbers, letters, symbols, graphics, scales or pictures, which is arranged on the back side of the hands and on which light from the light-emitting sources is made incident.

Description

  The present invention relates to a timepiece.

  Patent Document 1 discloses a timepiece using a light guide plate on which numerals are written as a dial plate. In a dark environment, the light source is turned on and light enters the light guide plate. Thereby, the number written on the light guide plate can be visually recognized even in a dark environment.

JP 2005-91101 A

  In this case, however, the numbers appear the same in a bright environment and a dark environment.

  Therefore, an object of the present invention is to provide a timepiece in which the appearance of the notation is different between a bright environment and a dark environment.

  The purpose is to include a pointer, a light source, and a peripheral part subjected to a light diffusion process for diffusing light from the light source, surrounded by the peripheral part and not subjected to the light diffusion process. It can be achieved by a timepiece including a light guide plate including a number, a character, a symbol, a figure, a scale, or a notation part representing a picture, and arranged on the back side of the pointer, on which light from the light emitting source is incident.

  It is possible to provide a watch that looks differently in bright and dark environments.

FIG. 1A is a front view of the timepiece of the present embodiment, and FIG. 1B is a rear view of the timepiece of the present embodiment. FIG. 2 is a block diagram showing the internal configuration of the timepiece according to the present embodiment. 3A is a cross-sectional view taken along line AA of FIG. 1B. FIG. 3B is a partially enlarged view of FIG. 3A. FIG. 4A is a front view of the dial unit, and FIG. 4B is an exploded perspective view of the dial unit. FIG. 5A is an explanatory diagram of a dot print pattern for printing dots on the light guide plate, and FIG. 5B is an enlarged view of the dot print pattern. 6A and 6B are explanatory diagrams of how numbers appear on the dial unit in a bright environment and a dark environment, respectively. 7A and 7B are explanatory diagrams of how numbers appear in the dial unit of the first modified example in a bright environment and a dark environment, respectively. FIGS. 7C and 7D are diagrams in a bright environment and a dark environment, respectively. It is explanatory drawing of how the English character looks in the dial unit of the 2nd modification in FIG. 8A and 8B are explanatory diagrams of how numbers appear in the dial unit of the third modified example in a bright environment and a dark environment, respectively. FIGS. 8C and 8D are diagrams in a bright environment and a dark environment, respectively. It is explanatory drawing of how to see the figure in the dial unit of the 4th modification in FIG. FIGS. 9A and 9B are explanatory diagrams of how the figure is viewed on the dial unit of the fifth modification example in a bright environment and a dark environment, respectively. FIGS. 9C and 9D are diagrams in a bright environment and a dark environment, respectively. It is explanatory drawing of how a figure looks in the dial plate unit of the 6th modification in FIG. FIGS. 10A and 10B are explanatory views of how numbers appear in the dial unit of the seventh modified example in a bright environment and a dark environment, respectively. FIGS. 10C and 10D are diagrams in a bright environment and a dark environment, respectively. It is explanatory drawing of how a figure looks with the dial plate unit of the 8th modification in FIG. FIG. 11 is an explanatory diagram of a dial unit of a ninth modification.

  FIG. 1A is a front view of the timepiece A of this embodiment, and FIG. 1B is a rear view of the timepiece A. The clock A is a wall clock, but is not limited thereto, and may be a table clock, an alarm clock, or a wristwatch. The timepiece A includes a front case FC and a rear case RC (hereinafter referred to as a case), a dial unit DU, a glass plate P, an hour hand HH, a minute hand MH, a second hand SH, and the like. When the dial unit DU is viewed from the front side, a hole 1h for an optical sensor OS described later can be visually recognized. Cases FC and RC are fixed to each other. The dial unit DU is held in the cases FC and RC. The glass plate P has optical transparency and is held in the case FC on the front side of the dial unit DU. The hands such as the hour hand HH are arranged between the dial unit DU and the plate P and rotate. The optical sensor OS is held in the cases FC and RC. Details will be described later. The case RC is detachably provided with a cover CV for replacement of the battery B described later.

  FIG. 2 is a block diagram showing the internal configuration of the watch A of this embodiment. The timepiece A includes a control unit C, LEDs L1 to L3, a movement MM, a battery B, and the like. The control unit C is realized by an electronic circuit formed on a printed board, and is realized by a CPU, a RAM, a ROM, and the like, for example. The movement MM is a mechanism that rotationally drives hands such as the hour hand HH, and is composed of a plurality of gears and is driven by being supplied with electric power from the battery B. The LEDs L1 to L3 are also turned on when power is supplied from the battery B. The optical sensor OS detects the brightness around the watch A. The control part C switches the lighting state of LEDL1-L3 based on the detection signal of optical sensor OS. Specifically, when the watch A is in a bright environment, the control unit C turns off the LEDs L1 to L3, and when the watch A is in a dark environment, the control unit C turns on the LEDs L1 to L3. . In addition, the brightness | luminance of LEDL1-L3 is the same. The LEDs L1 to L3 are examples of light emission sources.

  3A is a cross-sectional view taken along line AA of FIG. 1B. FIG. 3B is a partially enlarged view of FIG. 3A. As shown in FIG. 3A, printed circuit boards PB are arranged in the cases FC and RC. A ROM or the like that implements the control unit C is mounted on the printed circuit board PB. As shown in FIG. 3B, the LED L1 is mounted on the printed circuit board P1, and the same applies to the other LEDs L2 and L3. The printed circuit boards P1 and PB are electrically connected to each other.

  4A is a front view of the dial unit DU, and FIG. 4B is an exploded perspective view of the dial unit DU. The dial unit DU is substantially circular and includes a sheet 1, a light guide plate 3, a film 5, and a light transmission plate 7 that are stacked in order from the back side to the front side. In the center of the sheet 1, the light guide plate 3, the film 5, and the light transmission plate 7, a hole for releasing the rotation shaft of the pointer such as the hour hand HH is provided.

  The sheet 1 does not have optical transparency and is made of paper, synthetic resin, or metal. The sheet 1 has a hole 1h that exposes the optical sensor OS.

  The light guide plate 3 is made of a synthetic resin having optical transparency. On the outer periphery of the light guide plate 3, LEDs L1 to L3 are arranged at equal angular intervals every 180 degrees. The LEDs L <b> 1 to L <b> 3 are arranged at an equal distance from the center of the light guide plate 3. Concave portions 381 to 383 facing the LEDs L1 to L3 are formed on the outer periphery of the light guide plate 3, respectively. When the LEDs L1 to L3 are turned on, the light from the LEDs L1 to L3 enters the 3. The light guide plate 3 is partially subjected to light diffusion processing that reflects light incident on the light guide plate 3 from the LEDs L <b> 1 to L <b> 3 and diffuses it to the front side of the light guide plate 3. Details will be described later.

  The film 5 is made of a light-transmitting synthetic resin and functions as a diffusion plate. Note that the dial unit DU may not include the film 5.

  The light transmission plate 7 has light transmittance and is made of glass or synthetic resin. Although not shown in FIGS. 4A and 4B, numbers 1 to 12 for indicating the time are printed on the light transmission plate 7.

  Since the sheet 1, the light guide plate 3, the film 5, and the light transmission plate 7 are arranged so as to overlap each other, they function as a dial plate. Further, the light that has entered the light guide plate 3 from the LEDs L <b> 1 to L <b> 3 is reflected by the portion of the light guide plate 3 that has been subjected to the light diffusion process, and passes through the film 5 and the light transmission plate 7. Thereby, when the watch A is in a dark environment, the dial unit DU emits light.

  Next, the light diffusion process performed on the light guide plate 3 will be described. The back surface of the light guide plate 3 is subjected to a light diffusion process for diffusing the light from the LEDs L1 to L3 to the front side, specifically, a dot printing process in which a plurality of dots are printed on the back surface of the light guide plate 3. . The plurality of dots reflect light incident on the light guide plate 3 from the LEDs L <b> 1 to L <b> 3 and diffuse to the front side of the light guide plate 3. Thereby, the front of the light guide plate 3 can emit light.

  FIG. 5A is an explanatory diagram of a dot printing pattern for printing dots on the light guide plate 3. Actually, as shown in FIG. 5A, the dot print pattern is not printed on the entire surface of the light guide plate 3, and an area where dots are not printed partially is formed on the light guide plate 3 according to the dot print pattern. Is done. Details will be described later.

  The dot print pattern can be divided into regions 32A1 to 32A3 and boundary lines 32B1 to 32B3. The regions 32A1 to 32A3 are opposed to the LEDs L1 to L3, respectively, and each has a fan shape. Light incident on the light guide plate 3 from the LED L1 is mainly reflected by the region 32A1. Similarly, light incident on the light guide plate 3 from each of the LEDs L2 and L3 is mainly reflected by the regions 32A2 and 32A3, respectively. The areas 32A1 to 32A3 are examples of first, second, and third fan-shaped areas, respectively.

  Light incident on the light guide plate 3 is reflected by dots. Therefore, the larger the dot diameter, the more light is reflected. For this reason, when the distance from the light emitting source to the dot is equal, the dot having a larger diameter reflects more light than the dot having a smaller diameter. Further, the light incident on the light guide plate 3 is attenuated as the distance from the light source is increased. In the dot print pattern employed in the present embodiment, the diameter of dots close to the LEDs L1 to L3 is relatively small, and the diameter of dots away from the LEDs L1 to L3 is relatively large. For example, even in the region 32A1, the diameter of the dots close to the LEDL1 is relatively small, and the diameter of the dots away from the LEDL1 is relatively large. The same applies to the areas 32A2 and 32A3. Therefore, it is suppressed that the light quantity reflected in the area | region close | similar to LEDL1-L3 increases too much, and the light quantity reflected in the area | region away from LEDL1-L3 is suppressed too much. As described above, in this embodiment, the light guide plate 3 emits light with a substantially uniform light amount by adjusting the diameter of the dots based on the light amount according to the distance from the light source.

  For example, the boundary line 32B1 is located approximately equidistant from the two LEDs L1 and L2. For this reason, the light from both the LEDs L1 and L2 reaches the boundary line 32B1, but the light reaching the boundary line 32B1 is attenuated. In the light guide plate 3 of the present embodiment, the dot diameter at the boundary line 32B1 is determined based on the amount of light at the boundary line 32B1. Thereby, it is suppressed that the light quantity reflected by the boundary line 32B1 becomes small. Similarly, the dot diameters at the boundary lines 32B2 and 32B3 are determined based on the light quantity in each region. Thereby, the light-guide plate 3 can be light-emitted with a uniform light quantity.

  FIG. 5B is an enlarged view of the dot print pattern. In this dot printing pattern, an array of a plurality of dots is set so that three adjacent dots are in a regular triangle shape. Further, since the LEDs L1 to L3 are arranged at equiangular intervals around the center of the light guide plate 3, the LEDs L1 to L3 are also arranged in a regular triangle shape.

  In the present embodiment, as shown in FIG. 5B, the dots are arranged at the vertices of an equilateral triangle. Therefore, the dots arranged in the region 32A1 and the region 32A2 have a line-symmetric relationship with respect to the boundary line 32B1 where the region 32A1 and the region 32A2 are in contact with each other. For this reason, the density of the dots arranged on the boundary line 32B1 is the same as the density of the dots arranged in the region 32A1 and the region 32A2.

  Further, the region 32A2 and the region 32A3 have a line-symmetric relationship with the boundary line 32B2 as the center, and the density of the dots arranged on the boundary line 32B2 is the same as the density of the dots arranged in the region 32A2 and the region 32A3. is there. Further, the region 32A3 and the region 32A1 are symmetrical with respect to the boundary line 32B3, and the density of the dots arranged on the boundary line 32B2 is the same as the density of the dots arranged in the region 32A3 and the region 32A1. is there.

  FIG. 6A is an explanatory diagram of how numbers appear on the dial unit DU in a bright environment. As described above, the LEDs L1 to L3 are turned off in a bright environment. The peripheral portion 32 is subjected to a light diffusion process, and specifically, a plurality of dots are printed according to the dot printing pattern shown in FIG. 5A. The color of the dots in the peripheral portion 32 is white. The notation 34 surrounded by the peripheral portion 32 is not printed with dots and is not subjected to light diffusion processing. In addition, the notation unit 34 represents a number.

  A colored notation portion 74 is solidly printed in black on the front or back of the light transmission plate 7 disposed on the front side of the light guide plate 3 or on the front side of the film 5. The colored notation 74 and the notation 34 represent the same number. The light transmission plate 7 has light transmission, but the colored notation 74 does not transmit light. The colored notation portion 74 is located and overlaps in the notation portion 34, is thinner than the notation portion 34, and does not protrude from the notation portion 34. Accordingly, the notation unit 34 appears to border the periphery of the colored notation unit 74. Therefore, in a bright environment, the thickness of the line of the colored notation 74 is visually recognized as the thickness of a numeric line. The sheet 1 disposed on the back side of the light guide plate 3 is also white. For this reason, since the dots in the peripheral portion 32 and the sheet 1 are the same color, the dots can be made inconspicuous in a bright environment.

  FIG. 6B is an explanatory diagram of how numbers appear on the dial unit DU in a dark environment. The LEDs L1 to L3 are lit in a dark environment. When the LEDs L1 to L3 are turned on, the peripheral part 32 subjected to the light diffusion process emits light, but the notation part 34 and the colored notation part 74 not subjected to the light diffusion process do not emit light. For this reason, in the dark environment, the number of the thickness which combined the description part 34 and the colored description part 74 is visually recognized. For this reason, as shown in FIGS. 6A and 6B, the number lines appear thicker in a dark environment than in a bright environment. In this way, numbers can be emphasized in a darker environment than in a bright environment. As a result, the visibility of numbers in a dark environment is improved. Also, the way numbers look different in bright and dark environments.

  In addition, the color of the color description part 74 should just be a color which can be visually recognized in a bright environment. Further, the present embodiment may not include the light transmission plate 7 and the film 5. In that case, instead of printing the colored notation portion 74 on the light transmission plate 7, the colored notation portion may be printed on the front surface of the sheet 1 or the back surface of the light guide plate 3.

  The color of the dots printed on the peripheral portion 32 may be any color as long as it can reflect light.

  Next, a dial unit of a modification will be described. In the following modified examples, similar components are denoted by similar reference numerals, and redundant description is omitted. 7A and 7B are explanatory diagrams of how numbers appear on the dial unit DUa of the first modified example in a bright environment and a dark environment, respectively. The notation portion 34a is subjected to a solid printing process in which white solid printing is performed on the back surface of the light guide plate 3a. The colored notation 74 a is solidly printed in black on the front or back of the light transmission plate 7 a or the front of the film 5. The colored notation 74a is thicker than the color notation 74 described above. The colored notation portion 74a is located and overlaps in the notation portion 34a, is thinner than the notation portion 34a, and does not protrude from the notation portion 34a.

  Since the light transmission plate 7a is disposed on the front side of the light guide plate 3a, the colored notation portion 74a covers a part of the notation portion 34a printed in white. That is, only the portion between the outer edge of the notation portion 34a and the outer edge of the color notation portion 74a is exposed in the entire notation portion 34a printed in white.

  When the LEDs L1 to L3 are turned on, the notation 34a emits light together with the peripheral portion 32 as shown in FIG. 7B. This is because, as described above, the notation portion 34a is solidly printed in white on the back surface, and the light from the LEDs L1 to L3 is also reflected by the notation portion 34a. In addition, the dot color of the peripheral portion 32 and the color of the notation portion 34a are the same white. For this reason, the light amount reflected by the notation portion 34 a is larger than that of the peripheral portion 32. Thus, the light reflecting process for reflecting light more strongly than the peripheral portion 32 is performed on the notation portion 34a. For this reason, in the dark environment, the periphery of the colored notation portion 74a can be made to emit light more strongly than the peripheral portion 32, and the numbers indicated by the colored notation portion 74a can be emphasized. In this way, numbers can be emphasized in a darker environment than in a bright environment. As a result, the visibility of numbers in a dark environment is improved. Also, the way numbers look different in bright and dark environments. In order to facilitate understanding, FIG. 7B shows a boundary line between the notation portion 34a and the peripheral portion 32, but it is not actually visible.

  Further, it is not necessary that the whole of the notation portion 34a is printed in white and only the portion not covered with the colored notation portion 74a may be printed in white.

  The color solidly printed on the notation portion 34a and the color of the dots on the peripheral portion 32 are white, but are not limited to this. For example, the color solidly printed on the notation portion 34a may be a similar color to the dots in the peripheral portion 32, or may be a color having a higher reflectance than the dots in the peripheral portion 32. In any case, the notation 34a can reflect light more strongly than the peripheral portion 32.

  FIGS. 7C and 7D are explanatory diagrams showing how English letters appear on the dial unit DUa ′ of the second modified example in a bright environment and a dark environment, respectively. The notation 34a ′ of the light guide plate 3a ′ and the colored notation 74a ′ of the light transmission plate 7a ′ represent alphabetic characters. Also in such a case, the notation 34a 'around the colored notation 74a' can be made to emit light stronger than the periphery 32, and the English letters can be emphasized. This improves the visibility of English letters in a dark environment. Note that the dial unit DU, DUa, DUa ′ may not include a sheet.

  8A and 8B are explanatory diagrams of how numbers appear on the dial unit DUb of the third modified example in a bright environment and a dark environment, respectively. No dots or colors are printed on the peripheral portion 32b of the light guide plate 3b, and dots are printed on the notation portion 34b. In this way, the light diffusion process is not performed on the peripheral portion 32b, and the light diffusion process is performed on the notation portion 34b. As a result, in the dark environment, the peripheral portion 32b can cause the notation portion 34b to emit light without emitting light, and the visibility of the notation portion 34b in the dark environment is ensured.

  In addition, the sheet 1b disposed on the back side of the light guide plate 3b and the dots of the notation portion 34b have the same color or similar colors. Thereby, the peripheral part 32b and the notation part 34b look the same color or a similar color in a bright environment. Accordingly, it is difficult to see the notation 34b in a bright environment, and it seems that the notation 34b is not provided in the dial unit DUb. On the other hand, it is possible to make the user visually recognize the numbers described by the notation unit 34b by causing the notation unit 34b to emit light in a dark environment. Thus, the appearance of the dial unit DUb can be changed in a bright environment and a dark environment.

  The dots printed on the notation portion 34b are also printed according to the dot pattern shown in FIG. 5A. Therefore, the notation part 34b can emit light uniformly. Moreover, it can light-emit uniformly also about the some description part provided in the light-guide plate 3b.

  The color of the sheet 1b and the color of the dots in the notation portion 34b may be other than the same color and similar colors. In this case, in a bright environment, the visibility of the notation portion 34b is improved due to the difference between the color of the sheet 1b and the color of the dots of the notation portion 34b. Also in this case, since only the notation portion 34b emits light in a dark environment, the visibility of the notation portion 34b in a dark environment can be ensured.

  8C and 8D are explanatory diagrams of how the figure is seen on the dial unit DUb ′ of the fourth modified example in a bright environment and a dark environment, respectively. The notation portion 34b ′ represents a figure. Also in this case, in the dark environment, the peripheral portion 32b ′ of the light guide plate 3b ′ does not emit light, and only the notation portion 34b ′ emits light.

  FIGS. 9A and 9B are explanatory diagrams of how the figure is seen on the dial unit DUb′a of the fifth modified example in a bright environment and a dark environment, respectively. The notation 34b'a of the light guide plate 3b'a includes a region 34b'1 where dots are printed and a region 34b'2 where white printing is performed. The areas 34b′1 and 34b′2 are examples of a dot print area and a solid print area, respectively. Regarding the distance from the LED closest to the notation 34b'a, the region 34b'2 is farther away than the region 34b'1. For this reason, the light from the LED that reaches the region 34b′2 is attenuated more than the light that reaches the region 34b′1. However, since the area 34b′2 is solidly printed in white and the reached light is strongly reflected, the notation portion 34b′a can be caused to emit light uniformly. Note that the color solidly printed in the region 34b′2 may be other than white as long as the light incident on the light guide plate 3b′a can be reflected and emitted to some extent. In addition, the color that is solid-printed in the region 34b′2 may be the same color as the dot, a similar color, or a color that has a higher reflectance than the dot.

  FIGS. 9C and 9D are explanatory diagrams of how the figure is seen on the dial unit DUb′b of the sixth modified example in a bright environment and a dark environment, respectively. The notation 34b'b of the light guide plate 3b'b includes a region 34b'3 where dots are printed and a region 34b'4 where white printing is performed. The areas 34b′3 and 34b′4 are examples of a dot print area and a solid print area, respectively. The area 34b′4 is printed around the area 34b′3. In a dark environment, the region 34b′4 reflects light more strongly than the region 34b′3. That is, the edge of the figure to emit light emits intensely. For this reason, the figure looks larger and can be emphasized in a dark environment than in a bright environment. Note that the color solidly printed in the region 34b′4 may be other than white as long as the light incident on the light guide plate 3b′b can be reflected and emitted to some extent. Further, the color that is solid-printed in the region 34b′4 may be the same color as the dot, the similar color, or a color that has a higher reflectance than the dot. For ease of understanding, FIG. 9B shows boundary lines with the regions 34b′1 and 34b′2, and FIG. 9D shows boundary lines with the regions 34b′3 and 34b′4. Cannot be seen.

  FIGS. 10A and 10B are explanatory diagrams of how numbers appear on the dial unit DUc of the seventh modified example in a bright environment and a dark environment, respectively. A plurality of dots are printed on the peripheral portion 32c of the light guide plate 3c, and neither dots nor colors are printed on the notation portion 34c. As described above, the light diffusion process is not performed on the notation portion 34c, and the light diffusion process is performed on the peripheral portion 32c. In a dark environment, only the peripheral part 32c around the notation part 34c can emit light.

  In addition, the sheet 1c disposed on the back side of the light guide plate 3c and the dots on the peripheral portion 32c have the same color or similar colors. As a result, in a bright environment, the peripheral portion 32c and the notation portion 34c look the same color or similar colors. Therefore, it is difficult to see the notation 34c in a bright environment, and it seems that the notation 34c is not provided in the dial unit DUb. On the other hand, in the dark environment, the peripheral portion 32c can be caused to emit light so that the user can visually recognize the numbers written on the writing portion 34c. As described above, the dial unit DUc is different in how numbers appear in a bright environment and a dark environment.

  Note that the color of the sheet 1c and the dot color of the peripheral portion 32c may be other than the same color and similar colors. In this case, in a bright environment, the visibility of the notation portion 34c is improved due to the difference between the color of the sheet 1c and the color of the dots in the peripheral portion 32c. In this case as well, only the peripheral portion 32c emits light in a dark environment, so that the number looks different in a bright environment and a dark environment.

  The dots printed on the peripheral portion 32c are also printed according to the dot pattern shown in FIG. 5A. Therefore, the peripheral portion 32c can emit light uniformly.

  FIGS. 10C and 10D are explanatory diagrams of how the figure is seen on the dial unit DUc ′ of the eighth modified example in a bright environment and a dark environment, respectively. A plurality of dots are printed on the peripheral portion 32c ′ of the light guide plate 3c ′, and neither a dot nor a color is printed on the notation portion 34c ′. As for the dial unit DUc ′, the appearance of the figure is different between a bright environment and a dark environment. Note that the dial units DUb, DUb ′, DUb′a, DUb′b, DUc, and DUc ′ do not have to include a light transmission plate.

  FIG. 11 is an explanatory diagram of a dial unit DUd of the ninth modification. In the non-processing part 36d in the center of the light guide plate 3d, neither color nor dots are printed and the light diffusion process is not performed. Further, dots are printed on the ring-shaped peripheral portion 32d located around the non-processing portion 36d, and light diffusion processing is performed. No color or dots are printed on the notation portion 34d of the light guide plate 3d, but a colored notation portion 74d is printed on the light transmission plate 7d disposed on the front side of the light guide plate 3d so as to overlap the notation portion 34d. ing. Therefore, in a bright environment, the colored notation 74d printed on the light transmission plate 7d can be visually recognized.

  In a dark environment, the peripheral portion 32d around the notation portion 34d emits light, but the non-processing portion 36d does not emit light. For example, although not shown in FIG. 11, a pointer that emits light in a dark environment may be used for the watch. For example, it is conceivable to adopt a configuration in which light from a light source is incident on a pointer coated with a luminous paint, a pointer equipped with a light emitting source, or a pointer created with a light guide member. In such a case, in a dark environment, if the light amount of the light guide plate 3d on the back side of the pointer is too large, it may be difficult to visually recognize the pointer. For this reason, in the dial unit DUd of the present embodiment, at least the non-processing portion 36d overlapping the movement locus of the pointer is not subjected to the light diffusion process. Thereby, the visibility of the pointer in a dark environment can be improved.

  Note that the dots printed on the peripheral portion 32d of the light transmission plate 7d are also printed according to the dot printing pattern shown in FIG. 5A. For this reason, the peripheral portion 32d can also emit light uniformly. The dial unit DUd does not have to be provided with a sheet or film.

  The light guide plates 3, 3a, 3a ′, 3c, and 3c ′ described above may also be provided with a non-processing section so as to overlap at least the movement locus of the pointer.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and modifications and changes can be made within the scope of the gist of the present invention described in the claims. Is possible.

  The light diffusion process is not limited to the dot printing process. For example, instead of the dot printing process, a concavo-convex processing process for forming a plurality of fine concavo-convex parts on the back surface of the light guide plate may be performed. In this case, the roughness due to the concavo-convex portion is increased as the distance from the light source is increased. Further, the roughness of the concavo-convex portions at the boundary lines 32B1 to 32B3 is formed larger than the roughness of the concavo-convex portions at the regions 32A1 to 32A3 so as to correspond to the dot print pattern shown in FIG. 5A. Thereby, even when uneven | corrugated processing is performed, a light-guide plate can be light-emitted with a uniform light quantity. The unevenness processing is, for example, embossing or dimple processing.

  In the above embodiments and modifications, numbers, alphabets, and figures are shown as examples of notation and color notation, but are not limited to this, and are not letters, symbols, scales, or pictures. May be.

A Clock DU, DUa, DUa ', DUb, DUb', DUb'a, DUb'b, DUc, DUc ', DUd Dial plate unit HH Hour hand (pointer)
MH minute hand (pointer)
SH Second hand (pointer)
OS optical sensor C controller L1 to L3 LED (light emission source)
1, 1a, 1b, 1c sheet 3, 3b, 3b ′, 3b′a, 3b′b, 3c, 3d light guide plate 5 film 7, 7a, 7d transmission plate 32, 32b, 32b ′, 32c, 32c ′ peripheral portion 34, 34a, 34a ', 34b, 34b', 34b'a, 34b'b, 34c, 34c ', 34d Notation part 36d Non-processing area 74, 74a, 74a', 74d Colored notation part 32A1 to 32A3 area (first -3rd fan area)
32B1 to 32B3 region (first to third linear regions)
34b'1, 34b'3 area (dot printing area)
34b'2, 34b'4 area (solid print area)

Claims (4)

Guidelines,
A light source;
Peripheral portion subjected to light diffusion processing for diffusing light from the light source, surrounded by the peripheral portion and not subjected to the light diffusion processing, numbers, letters, symbols, figures, scales, or A timepiece including a notation portion representing a picture, and a light guide plate disposed on a back side of the pointer and receiving light from the light emitting source. The pointer can emit light,
2. The timepiece according to claim 1, wherein the light guide plate includes, in addition to the notation portion, a non-processing portion that overlaps at least a movement locus of the pointer and is not subjected to the light diffusion processing.   3. The timepiece according to claim 1, wherein the light diffusion processing is dot printing processing for printing a plurality of dots on the back surface of the light guide plate, or uneven processing processing for forming a plurality of unevenness on the back surface of the light guide plate. The light diffusion process is the dot printing process,
The timepiece according to claim 3, wherein a diameter of the dot increases with distance from the light emitting source.

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