JP3897411B2 - Flash device and camera having the flash device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flash device used for photographing and a camera having the flash device.
[0002]
[Prior art]
Conventionally, in a light guide plate flash device (also referred to as a light guide flash device), the light guide plate 1 disposed in front of the flash light source unit 3 from the reflection shade 3a and the xenon tube 3b is abutting portion 2c of the main body 2 as shown in FIG. , 2d and the vicinity of the light emitting part 1c of the light guide plate 1 are positioned and fluffed with an outer diameter shape by positioning ribs 2e of the main body 2, and a front plate 4 is attached to the front of the main body 2. The upper part is covered with a lid 5.
In addition, in the illumination device described in Japanese Patent Laid-Open No. 8-234277, the light guide plate flash device has a basic structure, but the optical component holding means and the like are not clearly shown.
[0003]
[Problems to be solved by the invention]
By the way, the light guide plate used in the light guide plate flash device conventionally uses all the surfaces as reflection or refracting surfaces, and there is a drawback that if the positioning is performed with the outer diameter shape, accurate positioning cannot be performed. There is a problem that an error occurs in the reflected light bundle, the light use efficiency is lowered, and uniform performance (for example, guide number / light distribution characteristic) cannot be obtained.
[0004]
The present invention eliminates the above-mentioned disadvantages of the prior art, makes effective use of a gate that does not function optically effectively by utilizing a gate portion at the time of injection molding of a light guide plate used in a light guide plate flash device, and further guides the light guide plate. by utilizing the ribs during injection molding, it shall be the first object to provide a flash light emission device capable of performing a reliable retention of the illumination optical system without compromising performance. Also, the present invention is to provide an improved flash light emission device of the injection moldability and assembly of the light guide plate during injection molding for use with the light guide plate flash device and the second object.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is a flash device using a light guide plate, wherein the light guide plate is positioned and rotated when the device body is mounted using the gate part and rib part during molding. is there.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
According to a first aspect of the present invention, there is provided a flash device that uses a light guide plate to control light collection. The flash device is formed as a positioning means for the light guide plate using a gate portion at the time of forming the light guide plate , and the rib portion is used to form the light guide plate. By using the rotation stop means of the light guide plate, it is possible to hold the illumination optical system of the flash device with stable control action of the illumination optical system. According to the second aspect of the present invention, the light guide plate positioning means includes a positioning protrusion and a gate portion narrower than the positioning range at the tip portion, so that the burrs and burrs caused by cutting the gate portion after forming the light guide plate are formed.・ Even if deformation occurs, the positioning part is not affected at all, so the positioning part can be protected. According to the third aspect of the present invention, a plurality of ribs are formed on the extension line of the positioning means of the light guide plate and are projected from the incident surface of the flash light source. fluff, dirt, burnt like prevention and stability holds the flash emission light source Ru can.
[0008]
According to the fourth aspect of the present invention, since the flash device having the above-described configuration is incorporated in the camera, the illumination optical system group of the flash device is stably maintained as the camera and the light control function is good, so that proper flash photography can be performed. .
[0009]
【Example】
Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
FIG. 1 is an exploded perspective view of the flash device of this embodiment.
In the figure, reference numeral 11 denotes a light guide plate, which is a colorless and transparent illumination optical system constituted by injection molding, and is a gate portion 11a formed at the time of injection molding serving as a positioning portion at the center of the edge of the front surface which is the injection surface 11c. And a rib portion 11b formed at the time of injection molding as a rotation stop portion at the center of the edge of the rear surface, which is the light incident surface 11d, at the position of the extension line of the gate portion 11a. A flash device body 12 has a positioning hole 12a with which the gate portion 11a engages and a rotation stop hole 12b with which the rib portion 11b engages on the bottom surface thereof in order to hold the light guide plate 11. A flash light source unit 13 is disposed at the rear of the light guide plate 11 and is formed of a flash light source 13b such as a reflective shade 13a and a xenon tube. A front plate 14 covers the front side of the light guide plate 11 on the exit surface 11c side. Reference numeral 15 denotes a lid for a flash device, which is a floating stopper for the light guide plate 11 and the flash light source unit 13, and is fixed to a floating guide portion (not shown) and the main body 12 with screws.
[0010]
In the present embodiment having the above configuration, the light beam emitted from the flash light source 13b is reflected directly and by the reflection shade 13a, and then irradiated toward the subject from the incident surface 11d of the light guide plate 11 of the illumination optical system. Uniform and highly condensing illumination can be obtained by light control in the light guide plate 11.
Here, when the light guide plate 11 is injection-molded, the light splitting plate 11 is divided into two parts with the smallest mold division, the light emitting / emitting surface 11c side is a parting line, the gate portion 11a is also used for positioning, and the injection surface 1c side. Since it is in the maximum thickness portion near the center, it is an arrangement with good moldability. In addition, since the rib portion 11b is used as an anti-rotation stop of the light guide plate 11 on the extended line of the gate portion 11a, it is possible to hold the illumination optical system accurately, and space efficiency is improved, and performance and quality can be stabilized.
[0011]
FIG. 2 shows a second embodiment of the present invention. In order to simplify the description, the same parts as those in the first embodiment are denoted by the same reference numerals, and only different points will be described.
FIG. 2 is an exploded perspective view of the flash device of this embodiment.
In the present embodiment, a positioning projection 11c ′ is formed at the center of one edge of the exit surface 11c of the light guide plate 11, and a gate portion 11a ′ narrower than the positioning range is set on the tip surface of the positioning projection 11c ′. Is. Other configurations are the same as those of the first embodiment.
[0012]
In the present embodiment having the above-described configuration, burrs, burrs, deformations, etc. that occur when the gate portion 11a ′ after injection molding is cut do not affect the attachment of the light guide plate 11 to the flash device main body 12. The injection moldability and assemblability can be improved.
[0013]
FIG. 3 shows a third embodiment of the present invention.
FIG. 3 is an exploded perspective view of the flash device of this embodiment.
In the present embodiment, a rib portion 11e is provided at the center of the other edge portion so as to face the rib portion 11b formed at the center of one edge portion of the incident surface 11d of the light guide plate 11, and both ribs 11b and 11e are provided on the incident surface 11d. Further, it is formed so as to protrude slightly toward the flash light source 13b, so that it also serves as a positioning portion for the reflective shade 13a. Other configurations and functions are the same as those in the first embodiment.
[0014]
In this embodiment having the above-described configuration, a protective glass or chemically strengthened glass is inserted (adhered, press-fitted, etc.) between the ribs 11b and 11e of the light guide plate 11 to form a hermetically sealed structure with the flash light source 13 so that the light guide plate 11 is sealed. It is possible to prevent dust, scratches, dirt, burns, and the like of the flash light source 13 and to prevent performance deterioration.
[0015]
FIG. 4 shows a reference example of the present invention. FIG. 4 is an exploded perspective view of the flash device of this reference example. In this reference example, the light guide plate 11 of the first embodiment is divided into three. That is, it comprises a side light guide plate 21 'that is the same shape as the left and right sides of the central light guide plate 21. The central light guide plate 21 has a gate portion 21a serving as a positioning portion on one edge side of the exit surface 21c and a rotation stop on the other edge side of the entrance surface 21d. Each of the left and right side light guide plates 21 'is formed with a gate portion 21a' serving as a positioning portion on one edge side of the exit surface 21c 'and a rib portion 21b' on one side surface. When the light plates 21 are arranged side by side, the left and right sides are arranged upside down.
[0016]
Reference numeral 22 denotes a flash device main body, and a positioning hole (not shown) for engaging the gate portion 21a and a gate portion 21a 'of one side light guide plate 21' are engaged with the bottom surface thereof to hold the central light guide plate 21. Abutting portions 22c and 22d with which the rib portions 21b 'of the left and right side light guide plates 21' abut are formed on both inner side surfaces thereof. A flash light source unit 23 is disposed at the rear of the light guide plates 21 and 21 'and is formed of a flash light source 23b such as a reflective shade 23a and a xenon tube. A front plate 24 covers the front side of the exit surfaces 21c and 21c 'of the light guide plates 21 and 21' . Reference numeral 25 denotes a lid for a flash device, which has a steady-state hole 25a that engages with the rib portion 21b of the light guide plate 21 and a positioning hole 25b that engages with the gate portion 21a 'of the other side light guide plate 21'. It is fixed with screws.
[0017]
In the present embodiment having the above-described configuration, assembly of the light guide plates 21 and 21 'to the flash device main body 22 will be described.
First, the gate portion 21a of the central light guide plate 21 is positioned by engaging the positioning hole on the bottom surface of the main body 22, and then the gate portion 21a 'of the side light guide plate 21' on the right side in the drawing is positioned on the positioning hole on the bottom surface of the main body 22. The rib portion 21b 'is brought into contact with the abutting portion 22c.
Furthermore, when the side light guide plate 21 ′ on the left side in the figure is mounted in an inverted state with respect to the side light guide plate 21 ′ on the right side, the rib portion 21b ′ is brought into contact with the abutting portion 22d and the flash device lid 25 is used. When covered, the gate portion 21a 'is engaged with the positioning hole 25b and positioned. At the same time, the rib portion 21b of the central light guide plate 21 is engaged with the steady stop hole 25a of the flash device lid 25 and is prevented from rotating, whereby the illumination optical system group including the central light guide plate 21 and the left and right side light guide plates 21 '. Is securely held.
In this embodiment, by using a plurality of light guide plates, boundary surface reflection and refraction due to an increase in optical surface are repeated, and the light control action of the illumination optical system group is improved.
[0018]
Furthermore, by incorporating the flash device of each of the above embodiments into the camera, the illumination optical system group of the flash device is stably maintained and the light control function is good, so that a camera capable of appropriate flash photography can be obtained.
[0019]
【The invention's effect】
As described above, in the flash device that uses the light guide plate to control light collection, the present invention shown in claim 1 is formed as a positioning means for the light guide plate by using the gate portion at the time of forming the light guide plate and the rib portion. By using as a means for preventing rotation of the light guide plate, it is possible to accurately hold the light guide plate as the illumination optical system of the flash device, and the space efficiency is improved. According to the second aspect of the present invention, since the gate portion as the positioning means of the light guide plate is formed in a range narrower than the positioning range, even if burrs, burrs, and deformation are generated due to the gate portion cutting after the light guide plate is formed. Since the positioning part is not affected at all, the positioning part can be protected. According to the third aspect of the present invention, a plurality of ribs are formed on the extension line of the positioning means of the light guide plate and are projected from the incident surface of the flash light source. fluff, dirt, burnt like prevention and stability holds the flash emission light source Ru can.
[0020]
According to the fourth aspect of the present invention, since the camera is equipped with the flash device having the above-described configuration, the illumination optical system group of the flash device is stably maintained as the camera and the light control function is good, so that proper flash photography can be performed.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a flash device according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of a flash device according to a second embodiment of the present invention.
FIG. 3 is an exploded perspective view of a flash device according to a third embodiment of the present invention.
FIG. 4 is an exploded perspective view of a flash device according to a reference example of the present invention.
FIG. 5 is an exploded perspective view of a conventional flash device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Light guide plate 21 Central light guide plate 21 'Side light guide plate 11a, 11a', 21a 'Gate part 11b, 11e, 21b, 21b' Rib part 12, 22 Flash apparatus main body 12a Positioning hole 12b Anti-rotation hole 13, 23 Flash light source unit 14, 24 Front plate 15, 25 Flash device lid

Claims (4)

In a flash device that uses a light guide plate to control light collection, a gate portion at the time of forming the light guide plate is formed in the maximum thickness portion near the center of the exit surface side, and the gate portion is used as positioning means for the light guide plate. In addition, the flash device is characterized in that a rib portion at the time of forming the light guide plate is used as a rotation stop means for the light guide plate . 2. The flash device according to claim 1, wherein the positioning means of the light guide plate includes a positioning projection and a gate portion narrower than the positioning range at the tip .   2. The flash device according to claim 1, wherein a plurality of ribs are used on an extension line of the positioning means of the light guide plate and are projected from the incident surface of the flash light emitting light source. 4. A camera comprising the flash device according to claim 1 incorporated in a camera body.

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