JP2003084340A - Strobe zoom mechanism - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When a large load or an external force is applied to a head assembly, an excessive force is not applied to a gear, thereby preventing wear and breakage of the gear and constantly strobe. Perform zoom operation. A strobe zoom mechanism engages a worm gear with a feed gear held in a group that accommodates a light emitting unit,
By moving the feed gear in the axial direction of the worm gear by the rotation of the worm gear, the assembly is moved back and forth to change the angle of incidence, but the feed gear is held at a predetermined position of the gear holder by the elastic force of a spring. Accordingly, when a large load or an external force is applied to the head assembly, the feed gear pushes up the spring and separates from the worm gear, so that an excessive force is not applied to the gear, thereby preventing the gear from being worn or damaged. . Even if the shape of the gear is deformed due to repeated operations due to repeated operations, a stable operation can always be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strobe zoom mechanism for moving a reflecting mirror ASSY, which is a light emitting portion of a strobe, back and forth to change an angle of incidence.

[0002]

2. Description of the Related Art Conventionally, as a structure example of a zoom mechanism for performing stroboscopic zoom, a worm gear (driving gear) for sending a reflecting mirror ASSY (hereinafter, referred to as a head assembly), which is a light emitting portion of a strobe, back and forth, There is one in which a feed gear held by a head assembly is meshed.

In the strobe zoom mechanism having such a structure, by rotating the worm gear, the head assembly holding the plastic plate-like feed gear meshing with the worm gear is moved back and forth along the axial direction of the worm gear.

[0004]

However, in the conventional stroboscopic zoom mechanism as described above, the worm gear that feeds the head assembly back and forth is made of a plastic feed gear that is fixedly held inside the head assembly. Since the gear meshes with the worm gear, if there is a large load on the head assembly or if there is a force to move the head assembly from the outside, there is no escape area for the feed gear and this gear may be worn or damaged. However, there is a problem in that a product that cannot operate or that operates unstable occurs.

In another structure example of the conventional stroboscopic zoom mechanism, there is a structure that avoids the above problems, but the structure is complicated and the number of parts is large, so that the product cost rises and There is a problem that assembly efficiency is poor.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is not to apply an unreasonable force to a gear even when a large load or an external force is applied to a head assembly. Thus, it is an object of the present invention to provide a strobe zoom mechanism which can prevent wear and damage of gears and can always perform stable strobe zoom operation.

[0007]

In order to solve the problems of the present invention, the means of claim 1 engages a drive gear held by a reflecting mirror holder of a group for accommodating a light emitting part with a drive gear, and the drive gear. In a stroboscopic zoom mechanism that moves the reflecting mirror holder back and forth to change the radiation angle by rotating the feeding gear, the feeding gear is held at a predetermined position of the gear holder by the elastic force of a spring. Is characterized by.

According to a second aspect of the present invention, in the first aspect, the elastic force of a spring coil, which is a kind of the spring, is transmitted to the feed gear.

According to a third aspect of the present invention, in the second aspect, the feed gear and the spring coil are housed in the gear holder, and the gear holder is detachably attached to the reflecting mirror holder.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the feed gear is a plate member made of plastic, and the drive gear is a worm gear.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing a configuration according to an embodiment of a strobe zoom mechanism of the present invention. The strobe zoom mechanism of this example is supported by a head case 1 which is a housing of a head assembly, a slide rail 2 for sliding a reflecting mirror holder 6 back and forth, a slide rail 2 and a supporting portion of the reflecting mirror holder 6. A zoom shaft 3 movably passing through the motor, a motor 4 incorporated in the slide rail 2, a worm gear 5 rotatably supported by the motor 4 so as to vertically cross the central portion of the slide rail 2, and a zoom of the slide rail 2. A reflector holder 6 that is set on the slide rail 2 by movably penetrating the shaft 3 through a lower support portion, a gear holder 7 that is incorporated in the reflector holder 6 and holds a gear (not shown) inside, a worm gear The feed gear 8 meshes with the gear 5, and the coil spring 9 that applies a predetermined pressing force to the feed gear 8. The head case 1, slide rail 2, reflector holder 6 and the like described above form a part of the head assembly.

FIG. 2 is a front view of the gear holder 7 shown in FIG. A plate-shaped feed gear made of a plastic member is held inside the gear holder 7. A pressing force is applied to the gear 8 downward by a coil spring 9 in the figure. The coil spring 9 is inserted into and supported by the convex portion of the feed gear 8, and the lower portion of the gear 8 is pressed and held by the elastic force of the coil spring 9 to a predetermined position of the gear holder.

FIG. 3 is a front view of the reflector holder 6 shown in FIG. 1 and an exploded front view of the gear holder 7 portion before being incorporated in the reflector holder 6. With the feed gear 8 and the coil spring 9 incorporated in the gear holder 7 as shown in FIG.
1, one end of the coil spring 9 is supported by the upper wall of the gear holder storage portion 11, and the elastic force of the coil spring 9 is transmitted to the feed gear 8. After the gear holder 7 is stored in the gear holder storage portion 11, the reflector 13 is held by the screw 13 shown in FIG.
Is screwed on.

Here, when the motor 4 rotates and the worm gear 5 rotates, the feed gear 8 meshing with the motor 4 moves along the axial direction of the worm gear 5, whereby the reflector holder, which is a part of the head assembly, is moved. The angle of incidence is changed by the movement of 6 along the zoom shaft 3. The direction of this movement can be switched depending on the rotation direction of the worm gear 5.

In this way, the worm gear 5 rotates,
When a large load is applied to the reflector holder 6 while the reflector holder 6 is moving, the feed gear 8 pushes up the coil spring 9 and disengages from the worm gear 5, so that a large force is prevented from being applied to the feed gear 8. It Further, when an external force is applied to the head assembly and this external force is transmitted to the feed gear 8 via the gear holder 7 in the reflecting mirror holder 6, the feed gear 8 pushes up the coil spring 9 and disengages from the worm gear 5. It is possible to avoid applying a large force to the feed gear 8.

According to the present embodiment, the feed gear 8 meshing with the worm gear 5 is pressed and held at a predetermined position of the gear holder 7 by the elastic force of the coil spring 9, so that the head holding the feed gear 8 is held. When a large load is applied to the reflecting mirror holder 6 of the sub-assembly, the feed gear 8 pushes up the coil spring 9 and disengages from the worm gear 5. Therefore, no excessive force is applied to the feed gear 8, and the feed gear 8 is not worn or damaged. It is possible to prevent damage.

When an external force is applied to the reflecting mirror holder 6 of the head assembly and this external force is transmitted to the feed gear 8, this gear 8 pushes up the coil spring 9 and disengages from the worm gear 5, so that the gear 8 cannot be forced. Therefore, it is possible to prevent the gear 8 from being worn or damaged.
Therefore, the durability and reliability of the strobe zoom mechanism can be improved.

Further, during operation, even if the feed gear 8 is made of plastic, since the gear 8 is pressed by the coil spring 9 and held at a predetermined position in the gear holder 7, the gear 8 is repeatedly operated. Even if the shape of is deformed due to wear, etc., it is possible to reliably perform the moving operation,
A stable flash zoom operation can always be performed.

Further, since the stroboscopic zoom mechanism of this embodiment has a simple structure including the gear holder 7, the feed gear 8, the worm gear 5, the coil spring 9, etc., the number of parts is small, and the gear holder 7 is attached to and detached from the reflection holder 6. Since the structure can be stored freely, it is easy to assemble and the cost of the product can be reduced.

Further, when the feed gear 8 is damaged or worn, it is sufficient to remove the gear holder 7 from the reflecting mirror holder 6 and replace it with a new gear 8, and there are few replacement parts, and replacement workability is also good. Therefore, repair and maintenance costs can be kept low.

The present invention is not limited to the above-described embodiments, and can be implemented in various other modes in specific configurations, functions, actions, and effects without departing from the scope of the invention. .

[0022]

As described in detail above, according to the strobe zoom mechanism of the present invention, the feed gear is pressed by the coil spring and held at the predetermined position of the gear holder, so that a large load or load is applied to the head assembly. Alternatively, even if an external force is applied, the feed gear pushes up the coil spring and disengages from the worm gear so that excessive force is not applied to the gear, wear and damage to the gear can be prevented, and repeated operation Even if the shape of the gear is deformed due to wear or the like, it is possible to always perform a stable flash zoom operation.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a configuration according to an embodiment of a strobe zoom mechanism of the present invention.

FIG. 2 is a front view of the gear holder shown in FIG.

FIG. 3 is a front view of the reflector holder shown in FIG. 1 and an exploded front view of a gear holder portion before being incorporated in the reflector holder.

[Explanation of symbols]

1 head case 2 slide rails 3 zoom shaft 4 motor 5 Worm gear 6 Reflector holder 7 Gear holder 8 Feed gear 9 coil spring 11 Gear holder storage

Claims (4)

[Claims] 1. A reflecting gear holder is moved back and forth by engaging a feed gear held by a reflecting mirror holder of a set containing a light emitting portion with a driving gear and moving the feeding gear by rotation of the driving gear. A strobe zoom mechanism for changing the angle of incidence by moving the feed gear to a predetermined position of a gear holder by elastic force of a spring. 2. The strobe zoom mechanism according to claim 1, wherein an elastic force of a spring coil, which is a kind of the spring, is transmitted to the feed gear. 3. The strobe zoom mechanism according to claim 2, wherein the feed gear and the spring coil are housed in the gear holder, and the gear holder is detachably attached to the reflecting mirror holder. 4. The strobe zoom mechanism according to claim 1, wherein the feed gear is a plate member made of plastic, and the drive gear is a worm gear.