Dial unit, solar watch, and method of manufacturing dial unit

Abstract

To provide a dial unit that is easy to handle, a solar watch, and a method of manufacturing the dial unit.SOLUTION: A dial unit provided herein comprises a translucent upper dial 230, a translucent lower dial 210, and a reflective member 220 provided between the upper dial 230 and the lower dial 210.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a dial unit, a solar timepiece, and a method for manufacturing a dial unit. [Background technology]

[0002] Patent Document 1 discloses a solar-powered timepiece with a subdial provided, for example, at the 6 o'clock position relative to the planar center of the timepiece dial. The subdial portion is made up of a substrate, a first translucent colored film, and a second translucent colored film laminated together. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-44973 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration described in Patent Document 1, the substrate, the first light-transmitting colored film, and the second light-transmitting colored film are not integrally configured in the subdial portion, which poses a problem of being difficult to handle. [Means for solving the problem]

[0005] The dial unit includes a light-transmitting upper dial, a light-transmitting lower dial, and a reflecting member disposed between the upper dial and the lower dial.

[0006] The solar timepiece comprises the above-described dial unit and a solar cell.

[0007] The manufacturing method of the dial unit includes a step of preparing a lower dial having translucency, an upper dial having translucency with a diameter of half or less compared to the lower dial, a reflecting member, and a covering member having legs; a step of forming a first through-hole near the outer periphery of the upper dial, forming a second through-hole or a first recess in the lower dial, and forming a third through-hole or a U-shaped groove in the reflecting plate; a step of forming a recess in the lower dial; a step of fitting the reflecting member and the upper dial into the recess in sequence; a step of engaging the legs with the first through-hole, the second through-hole or the first recess, and the third through-hole or the U-shaped groove; and a step of fixing the upper dial and the lower dial by an adhesive or caulking.

Brief Description of the Drawings

[0008]

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DETAILED DESCRIPTION OF THE INVENTION

[0009] In the following figures, three mutually orthogonal axes will be described as the X-axis, Y-axis, and Z-axis. Also, the direction along the X-axis is the "X-direction", the direction along the Y-axis is the "Y-direction", and the direction along the Z-axis is the "Z-direction". The direction of the arrow is the + direction, and the direction opposite to the + direction is the - direction. Note that the Z-axis is a virtual axis along the vertical direction, with the +Z direction being upward and the -Z direction being downward. The -Z direction is the direction in which gravity acts. Also, a plan view from the Z-axis direction is simply referred to as a "plan view".

[0010] Referring to FIG. 1, the configuration of the clock 100 will be described.

[0011] As shown in FIG. 1, the clock 100 includes a dial 50, a second hand 2, a minute hand 3, and an hour hand 4. The clock 100 is a multi-axis solar clock 100 having a solar cell 90 on the back of the dial 50. Note that the clock 100 is also referred to as a solar clock 100. The clock 100 has a main dial, which is the dial 50, and three small dials, which are the sub-dials 31, 32, and 33.

[0012] The dial plate 50 is circular, and its outer periphery is surrounded by the dial ring 40. On the 3 o'clock side of the clock 100, a crown 61 is provided. On the 2 o'clock side of the clock 100, an operation button 9a is provided. On the 4 o'clock side of the clock 100, an operation button 9b is provided. Various functions of the clock 100 are executed by operating the crown 61 and the operation buttons 9a and 9b.

[0013] On the 12 o'clock side of the dial plate 50, a sub-dial 31 is provided. On the 9 o'clock side of the dial plate 50, a sub-dial 32 is provided. On the 6 o'clock side of the dial plate 50, a sub-dial 33 is provided. On the 4 o'clock side of the dial plate 50, a sub-dial 34 smaller than the sub-dials 31, 32, and 33 is provided.

[0014] The sub-dials 31, 32, 33, and 34 are, for example, a day-of-the-week meter, a 12-hour clock, a 24-hour clock, an indicator showing the remaining energy, etc. The number of the sub-dials 31, 32, and 33 is not limited to three, and it may have one or more sub-dials. Hereinafter, the dial plate 50 and the sub-dials 31, 32, and 33 will be collectively referred to as the dial plate unit 200 for explanation.

[0015] Next, the configuration of the clock 100 will be described with reference to FIG. 2.

[0016] As shown in FIG. 2, the internal structure of the clock 100 has a configuration in which a solar cell 90, a dial plate unit 200, and a dial ring 40 are laminated on a movement (not shown).

[0017] The dial plate unit 200 includes a circular dial plate 50 and three small circular sub-dials 31, 32, and 33. Hereinafter, in the dial plate unit 200, the dial plate 50 will be referred to as the lower dial plate 210 for explanation.

[0018] The dial ring 40 includes a ring-shaped annular portion 41 and a plurality of time scales 43 provided inside the annular portion 41. The time scales 43 project inside the annular portion 41.

[0019] In the center of the lower dial plate 210, a through hole 35a (see FIG. 3) for passing the shafts of the second hand 2, the minute hand 3, and the hour hand 4 is provided. In the center of the sub-dial 31, a through hole 31a for passing the shafts of the hands for displaying the day of the week meter, the 12-hour clock, the 24-hour clock, the indicator, etc. is provided. In the center of the sub-dial 32, a through hole 32a for passing the shafts of the hands in the same manner is provided. In the center of the sub-dial 33, a through hole 33a for passing the shafts of the hands in the same manner is provided.

[0020] Next, with reference to FIGS. 3 to 11, the configuration of the dial plate unit 200 will be described.

[0021] As shown in FIG. 3, the dial plate unit 200 includes a lower dial plate 210, a reflecting member 220, an upper dial plate 230, and a covering member 240. The reflecting member 220 is disposed between the lower dial plate 210 and the upper dial plate 230.

[0022] The upper dial plate 230 has a diameter that is less than or equal to half the diameter of the lower dial plate 210. The diameter of the reflecting member 220 is substantially the same as the diameter of the upper dial plate 230 or is slightly smaller.

[0023] The lower dial plate 210 is provided with recesses 211 corresponding to the positions of the sub-dials 31, 32, and 33. The reflecting member 220 and the upper dial plate 230 are fitted into the recesses 211 (see FIG. 4). When the reflecting member 220 and the upper dial plate 230 are fitted into the recesses 211, the upper surface 230a of the upper dial plate 230 is at the same height as the upper surface 210a of the lower dial plate 210 (see FIG. 6).

[0024] In this way, since the height of the upper surface 230a of the upper dial plate 230 and the height of the upper surface 210a of the lower dial plate 210 are the same, there are no irregularities on the surface and the design property can be improved. Also, since the upper dial plate 230 does not move relative to the lower dial plate 210, a stable dial plate unit 200 can be configured with respect to movement.

[0025] The covering member 240 is made of a metallic material and has a columnar leg portion 241. In the lower letter plate 210, a second through hole 212 corresponding to the size of the leg portion 241 is provided in the recess 211 (see FIGS. 7 and 8). In the upper letter plate 230, a first through hole 232 corresponding to the size of the leg portion 241 is provided near the outer periphery (see FIG. 10).

[0026] As shown in FIG. 6, the leg portion 241 of the covering member 240 engages with the first through hole 232 and the second through hole 212. Thereby, the upper letter plate 230 and the reflecting member 220 are fixed to the lower letter plate 210. Also, the positions of the upper letter plate 230, the reflecting member 220, and the lower letter plate 210 can be aligned.

[0027] As shown in FIGS. 4 and 6, the covering member 240 is disposed across the outer peripheral portion 233 of the upper letter plate 230 and the edge portion 213 of the recess 211 of the lower letter plate 210. That is, the boundary between the outer peripheral portion 233 and the edge portion 213 is disposed overlapping the covering member 240 in plan view. In other words, the covering member 240 makes the boundary invisible.

[0028] Thus, since the covering member 240 is disposed overlapping the boundary, it is possible to hide the boundary portion in plan view, and the designability can be improved. Further, the covering member 240 can suppress the reflecting member 220 and the upper letter plate 230 from protruding from the recess 211.

[0029] As the material of the lower letter plate 210 and the upper letter plate 230, any material having translucency may be used, for example, a polycarbonate resin. Note that the material is not limited to the polycarbonate resin, and an acrylic resin, a polystyrene resin, or the like may be used.

[0030] As a material of the reflecting member 220, a reflective polarizing plate having both functions of light transmission and light reflection can be mentioned. The reflecting member 220 has a function of transmitting a required amount of light to generate electricity in the solar cell 90 and a function of reflecting a certain amount of light to brighten the dial 50. For example, if a silver-colored reflective polarizing plate is used, a white-based metallic color will appear.

[0031] As shown in FIG. 11, the covering member 240 is a ring-shaped member. The above-described leg portions 241 are provided on the lower surface of the covering member 240. Although not shown, for example, scales for indicator display, sub-scales, hour scales, characters, etc. are printed on the surface of the covering member 240. Due to the presence of the covering member 240, it is observed three-dimensionally.

[0032] A plurality of U-shaped recesses used for positioning are provided on the outer periphery of the lower dial 210. The recesses determine the position of the dial 50 in the rotational direction. The lower dial 210 is positioned by fitting a positioning pin (not shown) provided on the movement into the recesses.

[0033] As described above, since the reflecting member 220 and the upper dial 230 are fitted into the recess 211 of the lower dial 210, the reflecting member 220 and the upper dial 230 do not become scattered, and they can be easily handled. Further, since the reflecting member 220 is disposed between the upper dial 230 and the lower dial 210, for example, even if the reflecting member 220 is made of a thin material, it is sandwiched between the upper dial 230 and the lower dial 210, so that it can be easily handled.

[0034] Hereinafter, a manufacturing method of the dial unit 200 will be described with reference to FIG. 12.

[0035] As shown in FIG. 12, in step S11, the dials 230, 210 and members are prepared. Specifically, a translucent lower dial 210, a translucent upper dial 230 having a diameter of half or less compared to the lower dial 210, a reflecting member 220, and a covering member 240 are prepared.

[0036] In step S12, through holes 232 and 212 are formed. Specifically, a first through hole 232 is formed in the upper letter plate 230 near the outer periphery. A second through hole 212 is formed in the lower letter plate 210. In the present embodiment, no through holes or the like are formed in the reflecting member 220 (see FIG. 9).

[0037] In step S13, a recess 211 is formed in the lower letter plate 210. Specifically, on the surface of the lower letter plate 210, recesses 211 are formed at positions corresponding to the sub-dials 31, 32, and 33. Note that the formation of the through hole 212 may be performed after the formation of the recess 211.

[0038] In step S14, the reflecting member 220 and the upper letter plate 230 are fitted into the recess 211. Specifically, the reflecting member 220 is placed into the recess 211, and then the upper letter plate 230 is placed on the reflecting member 220.

[0039] In step S15, the leg portion 241 of the covering member 240 is engaged. Specifically, the leg portion 241 of the covering member 240 is sequentially inserted into and engaged with the first through hole 232 of the upper letter plate 230 and the second through hole 212 of the lower letter plate 210, which are fitted into the recess 211.

[0040] In step S16, it is fixed. Specifically, the upper letter plate 230 and the lower letter plate 210 are fixed using an adhesive on the outside of the reflecting member 220. Alternatively, the upper letter plate 230 and the lower letter plate 210 are fixed by caulking the leg portion 241 inserted into the second through hole 212 of the lower letter plate 210.

[0041] According to such a manufacturing method, the reflecting member 220 and the upper letter plate 230 are fitted into the recess 211 of the lower letter plate 210, and the leg portion 241 of the covering member 240 is engaged with the first through hole 232 of the upper letter plate 230 and the second through hole 212 of the lower letter plate 210. Therefore, the lower letter plate 210, the reflecting member 220, and the upper letter plate 230 do not become separated, and they can be easily handled. Further, since the upper letter plate 230 and the lower letter plate 210 are engaged and fixed, their positions can be aligned with each other.

[0042] As described above, the dial unit 200 of the present embodiment includes a top dial 230 having translucency, a bottom dial 210 having translucency, and a reflecting member 220 disposed between the top dial 230 and the bottom dial 210. According to this configuration, since the reflecting member 220 is provided between the top dial 230 and the bottom dial 210, for example, even when the reflecting member 220 is made of a thin material, it is sandwiched between the top dial 230 and the bottom dial 210, so that it can be easily handled.

[0043] Further, in the dial unit 200 of the present embodiment, the top dial 230 has a diameter that is half or less than that of the bottom dial 210, and the bottom dial 210 has a concave portion 211 on the upper side. It is preferable that the reflecting member 220 and the top dial 230 fit into the concave portion 211. According to this configuration, since the reflecting member 220 and the top dial 230 fit into the concave portion 211 of the bottom dial 210, the reflecting member 220 and the top dial 230 do not become separated, and it can be easily handled.

[0044] Further, in the dial unit 200 of the present embodiment, it is preferable that the upper surface 230a of the top dial 230 is at the same height as the upper surface 210a of the bottom dial 210. According to this configuration, since the upper surfaces 230a and 210a of the top dial 230 and the bottom dial 210 are at the same height, there are no irregularities on the surface, improving the design. Also, since there is no gap for the top dial 230 to move relative to the bottom dial 210, a stable dial unit 200 can be configured with respect to movement.

[0045] Further, in the dial unit 200 of the present embodiment, it has a covering member 240 that straddles the outer peripheral portion 233 of the upper dial 230 and the edge portion 213 of the concave portion 211. The boundary between the outer peripheral portion 233 and the edge portion 213 is preferably arranged to overlap with the covering member 240 in a plan view. According to this configuration, since the covering member 240 is arranged to overlap with the boundary, it is possible to hide the boundary portion in a plan view, and the design can be improved. Further, the covering member 240 can suppress the projection of the reflecting member 220 and the upper dial 230 from the concave portion 211.

[0046] Further, in the dial unit 200 of the present embodiment, the covering member 240 has legs 241. Near the outer periphery of the upper dial 230, it has a first through hole 232. At a position corresponding to the first through hole 232 in the lower dial 210, it has a second through hole 212. The legs 241 are preferably engaged with the first through hole 232 and the second through hole 212. According to this configuration, since the legs 241 of the covering member 240 are engaged with the holes of the upper dial 230 and the lower dial 210, etc., the upper dial 230, the reflecting member 220, and the lower dial 210 can be fixed. Further, by engaging the legs 241 with holes or the like, the positions of the respective members can be aligned.

[0047] Further, in the dial unit 200 of the present embodiment, the upper dial 230 and the lower dial 210 are preferably fixed by adhesion or caulking outside the reflecting member 220 in a plan view. According to this configuration, since they are fixed by adhesion or caulking outside the reflecting member 220, the upper dial 230 and the lower dial 210 can be fixed without affecting the reflecting member 220.

[0048] Further, the solar clock 100 of the present embodiment includes the dial unit 200 described above and a solar cell 90. According to this configuration, a solar clock 100 that is easy to handle each component can be provided.

[0049] Further, the manufacturing method of the dial unit 200 of the present embodiment includes a step of preparing a lower dial 210 having translucency, an upper dial 230 having translucency with a diameter of half or less compared to the lower dial 210, a reflecting member 220, and a covering member 240 having legs 241; a step of forming a first through hole 232 near the outer periphery of the upper dial 230, forming a second through hole 212 in the lower dial 210, and forming a recess 211 in the lower dial 210; a step of fitting the reflecting member 220 and the upper dial 230 into the recess 211 in this order; a step of engaging the legs 241 with the first through hole 232 and the second through hole 212; and a step of fixing the upper dial 230 and the lower dial 210 with an adhesive or caulking. According to this method, the reflecting member 220 and the upper dial 230 are fitted into the recess 211 of the lower dial 210, and the legs 241 of the covering member 240 are engaged with each member, so that the reflecting member 220 and the upper dial 230 do not become separated, and it is possible to facilitate handling. Further, since the upper dial 230 and the lower dial 210 are engaged and fixed, the positions of the respective members can be aligned.

[0050] Hereinafter, a modification of the above-described embodiment will be described.

[0051] As described above, the diameter of the upper dial 230 is not limited to being half or less of the diameter of the lower dial 210, and as shown in FIGS. 13 and 14, the diameters of the upper dial 1230 and the lower dial 1210 may be the same.

[0052] As shown in FIGS. 13 and 14, the dial unit 1000A of the modification includes an upper dial 1230, a lower dial 1210, and a reflecting member 1220 sandwiched between the upper dial 1230 and the lower dial 1210. As shown in FIG. 15, in this modification, legs 1231 are provided on the upper dial 1230. Four legs 1231 are provided, for example, in the circumferential direction of the outer periphery so that the dials 1230 and 1210 do not rotate. A fourth through hole 1212 (see FIG. 15) that engages with the legs 1231 is provided in the lower dial 1210.

[0053] The reflecting member 1220 has a diameter that is slightly smaller compared to, for example, the diameters of the upper letter plate 1230 and the lower letter plate 1210. As shown in FIG. 16, a fifth through-hole 1222 that engages with the leg portion 1231 is provided near the outer periphery of the reflecting member 1220. Alternatively, instead of the fifth through-hole 1222, a second U-shaped groove that opens in the outer peripheral direction may be provided.

[0054] By inserting and engaging the leg portion 1231 of the upper letter plate 1230 into the fifth through-hole 1222 of the reflecting member 1220 and the fourth through-hole 1212 of the lower letter plate 1210, their relative positions can be determined and they can be arranged. Furthermore, by disposing an adhesive 1250 between the upper letter plate 1230 and the lower letter plate 1210, the upper letter plate 1230, the reflecting member 1220, and the lower letter plate 1210 can be fixed. Note that it is not limited to using the adhesive 1250, and the upper letter plate 1230 and the lower letter plate 1210 may be fixed by using an adhesive tape. Regarding the color tone of the adhesive tape, the designability can be improved by making it the same color as the upper letter plate 1230 or transparent.

[0055] Note that it is not limited to providing the leg portion 1231 on the upper letter plate 1230; legs may be provided on the lower letter plate 1210 and a fourth through-hole 1212 may be provided on the upper letter plate 1230. Also, it is not limited to being the fourth through-hole 1212, and a recess as a second recess may be provided.

[0056] As described above, the diameters of the upper character plate 1230 and the lower character plate 1210 are the same. The upper character plate 1230 or the lower character plate 1210 has legs 1231, and the upper character plate 1230 or the lower character plate 1210 has a fourth through hole 1212 or a second recess at a position corresponding to the legs 1231. The reflecting member 1220 has a fifth through hole 1222 or a second U-shaped groove at a position corresponding to the legs 1231. The legs 1231 are preferably engaged with the fourth through hole 1212 or the second recess, and the fifth through hole 1222 or the second U-shaped groove. According to this configuration, since the legs 1231 are engaged with the holes of the upper character plate 1230, the reflecting member 1220, the lower character plate 1210, etc., the upper character plate 1230, the reflecting member 1220, and the lower character plate 1210 can be fixed. Further, by engaging the legs 1231 with the holes or the like, the positions of the respective members can be aligned.

[0057] As described above, the present invention is not limited to the configuration in which the reflecting member 220 and the upper character plate 230 are fitted into the recess 211 of the lower character plate 210. A through hole may be provided in the upper character plate 1230 having the same diameter as the lower character plate 1210, and the reflecting member 220 and the upper character plate 230 may be fitted into the through hole.

[0058] Specifically, as shown in FIGS. 17 and 18, the character plate unit 1000B of the modified example has a lower character plate 1210 and an upper character plate 1230 having the same diameter as the lower character plate 1210. Through holes are provided in the upper character plate 1230 at positions corresponding to the sub-dials 31, 32, 33. The reflecting member 220 and the upper character plate 230 are fitted into the through holes. The positions of the upper character plate 230 and the reflecting member 220 are determined by inserting the legs 241 provided on the covering member 240 into the fourth through hole 1212 of the lower character plate 1210. Further, by disposing the adhesive 1250 on the outer peripheral side of the reflecting member 220, the upper character plate 1230 and the lower character plate 1210 are fixed.

[0059] As in the modified example shown in FIG. 14 described above, the upper character plate 1230 and the lower character plate 1210 are not limited to being flat. As shown in FIG. 19, the upper character plate 1230 may be configured to bulge in the +Z direction.

[0060] In the nameplate unit 1000C of the modification shown in FIG. 19, the upper nameplate 1230 is formed to bulge upward (+Z direction) inside the engaging portion 1240 where the upper nameplate 1230 and the lower nameplate 1210 are fixed. Thereby, it becomes possible to change the visibility of the nameplate unit 1000C, and the designability can be improved. Note that in the upper nameplate 1230, only the upper surface may bulge and the lower surface may be flat.

[0061] By adopting such a configuration, it becomes possible to create a curved surface, and the light can be diffused to improve the designability.

[0062] As described above, the second through-hole 212 of the lower nameplate 210 is not limited to being a through-hole, and may be a recess as a first recess that does not penetrate.

[0063] As described above, the outer periphery of the reflecting member 220 is not limited to being disposed inside the leg portion 241 of the covering member 240. Instead, as in the reflecting member 220A of the modification shown in FIG. 20, the outer periphery may be enlarged by one size, and a third through-hole 222 may be provided in the vicinity of the outer periphery, and the leg portion 241 may be inserted into the third through-hole 222 to determine the positions of each other. The position of the third through-hole 222 is a position corresponding to the first through-hole 232 of the upper nameplate 230.

[0064] Also, as shown in FIG. 21, the reflecting member 220B of the modification may be formed with a first U-shaped groove 223 that opens in the outer peripheral direction instead of the third through-hole 222.

Description of Reference Numerals

[0065] 2…Second hand, 3…Minute hand, 4…Hour hand, 9a…Operation button, 9b…Operation button, 31, 32, 33, 34…Sub-dials, 31a, 32a, 33a…Through holes, 35a…Through hole, 40…Dial ring, 41…Annular part, 43…Hour scale, 50…Dial plate, 61…Ryuzu, 90…Solar cell, 100…Watch, solar watch, 200…Dial plate unit, 210…Lower dial plate, 210a…Upper surface, 211…Recess, 212…Second through hole, 213…Edge part, 220…Reflective member, 220A…Reflective member, 220B…Reflective member, 222…Third through hole, 223…First U-shaped groove, 230…Upper dial plate, 230a…Upper surface, 232…First through hole, 233…Outer peripheral part, 240…Cover member, 241…Leg part, 1000A, 1000B, 1000C…Dial plate units, 1210…Lower dial plate, 1212…Fourth through hole, 1220…Reflective member, 1222…Fifth through hole, 1230…Upper dial plate, 1231…Leg part, 1240…Engaging part, 1250…Adhesive.

Claims

1. An upper letter plate having translucency, A lower letter plate having translucency, A reflecting member disposed between the upper letter plate and the lower letter plate, A letter plate unit comprising the above.

2. The letter plate unit according to Claim 1, wherein the upper letter plate has a diameter that is half or less than that of the lower letter plate, the lower letter plate has a concave portion on the upper side, and the reflecting member and the upper letter plate are fitted into the concave portion. A letter plate unit.

3. The letter plate unit according to Claim 2, wherein the upper surface of the upper letter plate is at the same height as the upper surface of the lower letter plate. A letter plate unit.

4. The letter plate unit according to Claim 2, having a covering member straddling the outer peripheral portion of the upper letter plate and the edge portion of the concave portion, wherein the boundary between the outer peripheral portion and the edge portion is arranged to overlap the covering member in a plan view. A letter plate unit.

5. The letter plate unit according to Claim 4, wherein the covering member has legs, the vicinity of the outer periphery of the upper letter plate has a first through hole, the position corresponding to the first through hole in the lower letter plate has a second through hole or a first concave portion, the position corresponding to the first through hole in the reflecting member has a third through hole or a first U-shaped groove opening in the outer peripheral direction, and the legs engage with the first through hole, the second through hole or the first concave portion, and the third through hole or the first U-shaped groove. A letter plate unit.

6. The letter plate unit according to Claim 5, wherein the upper letter plate and the lower letter plate have the same diameter, the upper letter plate or the lower letter plate has legs, the upper letter plate or the lower letter plate has a fourth through hole or a second concave portion at a position corresponding to the legs, the reflecting member has a fifth through hole or a second U-shaped groove at a position corresponding to the legs, and the legs engage with the fourth through hole or the second concave portion, and the fifth through hole or the second U-shaped groove. A letter plate unit.

7. The letter plate unit according to Claim 6, wherein the upper letter plate and the lower letter plate are fixed by adhesion or caulking outside the reflecting member in a plan view. A letter plate unit.

8. A solar clock comprising the letter plate unit according to any one of Claims 1 to 7, and a solar cell.

9. A step of preparing a lower letter plate having translucency, an upper letter plate having translucency with a diameter that is half or less than that of the lower letter plate, a reflecting member, and a covering member having legs, A step of forming a first through hole near the outer periphery of the upper letter plate, forming a second through hole or a first recess in the lower letter plate, and forming a third through hole or a U-shaped groove in the reflecting member; A step of forming a recess in the lower letter plate; A step of fitting the reflecting member and the upper letter plate into the recess in this order; A step of engaging the leg portion with the first through hole, the second through hole or the first recess, and the third through hole or the U-shaped groove; A step of fixing the upper letter plate and the lower letter plate with an adhesive or caulking; A method for manufacturing a letter plate unit, comprising the steps.

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