JPH051834Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a projection clock, and in particular to a projection clock that displays the time by projecting images of the clock's time scale and hands onto a wall, ceiling, etc. Regarding type clocks.

[Conventional technology]

Projection clocks can display the time by projecting images of clock scales and hands onto walls, ceilings, etc. even when it is difficult to tell the time with a normal clock, such as at night or in a dark place. Therefore, if you suddenly wake up in the middle of the night and want to know the time, you can check the time by looking at the clock image displayed on the wall or ceiling without having to turn on the lights, without having to turn on the lights. There are several types known.

Such conventional projection watches, for example, emit light from the rear of a watch with a transparent dial,
There is one in which the images of the pointer and dial are enlarged through a magnifying lens and projected onto a projection surface.

However, in this conventional projection type watch, since the light source, the watch, and the magnifying lens are arranged in a straight line, the overall length of the device becomes long, and there is a problem that it is difficult to find a place to put it. In addition, the clock movement that moves the hands will be placed behind the transparent dial, but when light is shined on it, the shadow of this clock movement will be cast, making it difficult to see the clock image. There was also the issue of becoming.

In order to solve this latter problem, for example, as disclosed in Japanese Patent Publication No. 50-16949,
It is also possible to draw the hands of a watch on a transparent disc and rotate this transparent disc by rotating a roller or the like surrounding it, but in this case a complicated drive mechanism is required and there is a risk of malfunction. There are problems such as easy occurrence and high cost.

[Problems to be solved by the invention] The present invention was devised in view of the problems of the conventional projection type clock mentioned above. The object of the present invention is to provide a projection type clock that can provide the following.

[Means and actions for solving problems]

In order to achieve the above object, the projection type watch according to the present invention includes a mirror Fresnel lens, a pointer provided on the mirror Fresnel lens, and having a pointer whose rotational axis is located off the center of the mirror Fresnel lens. A time scale drawn in an inverted shape is provided on the surface of the mirror Fresnel lens along the rotation locus of the pointer, and a time scale is provided on the back side of the mirror Fresnel lens to rotate the pointer counterclockwise. a clock movement that is operated in a clock movement; a light projecting means located on the surface side of the mirror Fresnel lens and arranged to illuminate the surface of the mirror Fresnel lens with the rotation axis of the pointer as a center; and a projection lens disposed on an extension of the hand and time scale for enlarging and projecting images of the hands and time scale onto a projection plane.

According to the present invention having the above configuration, the light from the light projecting means provided on the surface side of the mirror Fresnel lens is reflected by the surface of the mirror Fresnel lens, and the pointer and time scale on the mirror Fresnel lens are reflected. The image is enlarged and projected onto a projection surface through a projection lens. In this case, if the rotation axis of the hand and the time scale are aligned with the center of the mirror Fresnel lens, the projected images thereof will not appear clearly. This is because distortion, blurring, etc. occur, and optical performance is not maintained. In this invention,
The rotation axis and time scale of the pointer are placed a predetermined distance away from the center of the mirror Fresnel lens, and the projection lens is placed on an extension of the pointer's rotation axis. A correct and focused image can be formed directly above.

〔Example〕

Hereinafter, the projection type watch according to the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic structural explanatory diagram of one embodiment of the present invention, and in the figure, 1 indicates an outer case of the projection type timepiece. A mirror Fresnel lens 2 is disposed on the base end side of the case 1.

As shown in FIG. 2, this mirror Fresnel lens 2 is formed by attaching a mirror-finished aluminum plate 2b to the groove side of a Fresnel lens 2a, and its surface 2d, that is, the reflective surface, is a smooth surface. It's summery.

As shown in FIGS. 1 to 3, on the surface 2d of the mirror Fresnel lens 2, a timepiece hand 3 consisting of a short hand and a long hand made of a non-transparent material is provided. As is clear from FIGS. 2 and 3, the rotation axis 3a of this pointer 3 is
The mirror Fresnel lens 2 is provided by being inserted through an opening 2c formed at a position slightly away from the center 2e.

In addition, the surface 2d of the mirror Fresnel lens 2
As shown in FIG.
is depicted in reverse. On the other hand, on the back side of the mirror Fresnel lens 2, there is a rotating shaft 3 of the pointer 3.
A clock movement 5 is provided which is connected to the pointer 3 and moves the pointer 3 in a counterclockwise direction.

A light projection means 6 for illuminating the mirror Fresnel lens 2 is provided on the upper surface 2d side of the mirror Fresnel lens 2, that is, on the side opposite to the installation side of the mirror Fresnel lens 2 in the case 1. The light projecting means 6 includes a halogen lamp 7 as a light source, a reflecting mirror 8 provided behind the halogen lamp 7 to reflect the light, and a condensing light beam to be directed toward the mirror Fresnel lens 2. A condensing lens 9 is provided. As shown in FIGS. 4 and 5, the halogen lamp 7 is mounted in a socket 13 provided on a substrate 12 on a base 11 fixed to a support frame 10 fitted into the case 1. Further, the reflecting mirror 8 and the condensing lens 9 are connected to a stay 1 erected on the substrate 12.
4 and 15, respectively. These condensing lens 9, halogen lamp 7, and reflecting mirror 8 are
In other words, the light from the light projecting means 6 illuminates the mirror Fresnel lens 2 around the rotation axis 3a of the pointer so that the line connecting the respective centers faces the rotation axis 3a of the pointer 3 on the mirror Fresnel lens 2. They are arranged in such a positional relationship.

The side of the light projecting means 6 and the rotation axis 3a of the pointer 3
A projection lens 18 is provided on the extension line for enlarging and projecting the images of the hand 3 and time scale 4 onto a projection surface such as a wall or ceiling. As shown in FIG. 5, the projection lens 18 is attached to a holder 19 having a cylindrical portion 19a partially circumferentially provided with a male thread. This holder 19 is attached to the support frame 1
It is attached so as to be movable in and out of an opening 20a having a female thread that engages with the male thread provided on the presser plate 20, which is fixed to the holding plate 20, so that focus adjustment can be performed.

As described above, in this embodiment, the pointer 3 and the time scale 4 are provided eccentrically with respect to the center of the mirror Fresnel lens 2, and the projection lens 18 is arranged on the extension line of the rotation axis of the pointer 3. However, as shown in Figure 6A, if the hands and time scale are placed concentrically with the mirror Fresnel lens,
When projected directly above, the projected image does not appear clearly. This is because distortion, blurring, etc. occur, and optical performance is not maintained. On the other hand, if configured as in this embodiment, as shown in FIG. 6B,
It becomes possible to form a correct image directly above.

FIG. 7 shows the projection type timepiece exterior case and its support base according to the above-described embodiment. That is, the case 1 has a cylindrical body 30 in which each member is housed, and this cylindrical body 30 is configured to be able to be divided into two in the axial direction as shown in the drawings. This cylindrical body 3
Engagement grooves 31 and 32 are provided around the inner surface of the 0 at the upper and lower parts, respectively. The above-mentioned support frame 10 is engaged with the upper engagement groove 31,
The light projecting means 6 and the projection lens 18 are fixed at predetermined positions. On the other hand, the lower engagement groove 32 has a mirror Fresnel lens support plate 3.
3 is attached. As shown in the figure, this support plate 33 is provided with a mirror Fresnel lens mounting portion 33a and a pointer insertion hole 33b, whereby the mirror Fresnel lens 2 and the timepiece movement 5 are arranged at predetermined positions. In addition,
In the figure, 34 is a focus adjustment aperture of the projection lens.

A front cover 36 is attached to the upper end of the cylindrical body 30, which is provided with an opening 36a for a projection lens and a ventilation hole 36b for cooling the light projecting means. Furthermore, a rear cover 38 that houses the timepiece movement 5 is attached to the lower side of the support plate 33. This rear cover 38 is provided with an opening 38a for time adjustment and a battery insertion slot 38b. In addition, 3 in the figure
9 is a lid of the battery insertion port 38b.

As described above, the mirror Fresnel lens, the light projecting means, and other members are housed in the case 1, and the case 1 is mounted on the support base 40 in this state. This support stand 40 is used to turn on and off the halogen lamp 7.
A transformer section 41 equipped with a switch 41a and a pair of support arms 42 provided on both sides of the transformer section
It has The case 1 has mounting portions 30a provided on opposing sides of the cylindrical body 30.
The support arm 42 is swingably attached to the support arm 42 via the support arm 42 .

When using the projection type clock according to the embodiment described above, first, the switch 41a of the transformer section 41 of the support base 40 is turned on. Then, the halogen lamp 7 of the light projecting means 6 is energized, and the halogen lamp 7 is turned on. The light from this lamp 7 passes through a condensing lens 9 and irradiates the mirror Fresnel lens 2 around the rotation axis 3a of the pointer 3. The reflected light from this mirror Fresnel lens 2 is reflected by the pointer 3.
It is projected together with the image of the time scale 4 through the projection lens 18, and is imaged on a projection surface such as a wall or ceiling to display the time. In this case, if the projection angle is not appropriate, the case 1 may be swung relative to the support base 40 to adjust it. In addition, if the focus is not in focus, the focus adjustment opening 3 of the case 1
4, the focus of the projection lens 18 can be adjusted by moving the holder 19 forward or backward.

In the embodiment described in detail above, the hands consist of a short hand and a long hand, but of course a second hand may be added to these hands. Furthermore, it is also possible to enhance the design effect of the projected image by forming these pointers from colored transparent plastic or by attaching a color filter to the projection lens.

〔effect〕

According to the present invention, by using a mirror Fresnel lens, the light projection means is provided on the same side as the projection lens, so the total length of the entire device is shortened compared to the case where light is projected from behind the clock. It can be made more compact. Additionally, since it uses a mirror Fresnel lens, the image of the watch movement placed on the back side is not projected onto the watch, so the time display will not be difficult to see. Furthermore, as a result of being compact, the lenses and the like can also be made smaller, and the clock mechanism can also be simplified, making it possible to reduce the cost of the device.

[Brief explanation of the drawing]

Fig. 1 is a schematic structural diagram of a projection type watch according to the present invention, Fig. 2 is a side view of a mirror Fresnel lens, Fig. 3 is a side view of the same, and Fig. 4 is a diagram showing the arrangement of a light projecting means and a projection lens. 5 is a sectional view taken along line A-A' in FIG. 4, and FIGS. 6A and B are
FIG. 7 is an explanatory diagram showing the reason why the rotation axis of the pointer is eccentric, and is an exploded perspective view of the case and the case support stand. Explanation of symbols, 1...Case, 2...Mirror Fresnel lens, 2a...Fresnel lens, 2b...
Aluminum plate, 2c, 20a, 38a...opening, 2d
... Surface, 2e ... Center, 3 hands, 3a ... Rotating shaft, 4 ... Time scale, 5 ... Clock movement, 6 ... Light projecting means, 7 ... Halogen lamp, 8
... Reflection mirror, 9 ... Condensing lens, 10 ... Support frame, 11 ... Base, 12 ... Substrate, 13 ... Socket, 14, 15 ... Stay, 16, 17, 1
9... Holder, 18... Projection lens, 19a...
... Cylindrical part, 20 ... Pressing plate, 30 ... Cylindrical body, 30
a...Mounting part, 31, 32...Engagement groove, 33...
Support plate, 33a... Mounting part, 33b... Pointer insertion hole, 34... Focus adjustment opening, 36... Front cover, 36a... Projection lens opening, 3
6b... Cooling vent, 38... Rear cover, 3
8b...Battery insertion slot, 39...Lid, 40...Support stand, 41...Transformer part, 41a...Switch,
42...Support arm.

Claims (1)

[Claims for Utility Model Registration] A mirror Fresnel lens, a pointer provided on the mirror Fresnel lens and having a rotation axis at a position off the center of the mirror Fresnel lens, and the pointer on the surface of the mirror Fresnel lens. a clock movement disposed on the back side of the mirror Fresnel lens to operate the pointer in a counterclockwise rotation direction; a light projecting means located on the surface side of the Fresnel lens and arranged to illuminate the surface of the mirror Fresnel lens around the rotation axis of the pointer; 1. A projection type watch comprising a projection lens for enlarging and projecting images of hands and a time scale onto a projection surface.