JPH03100536A - Stroboscopic device capable of changing irradiation angle - Google Patents

Abstract

PURPOSE:To precisely control the angle of a reflection hood and to control an irradiation angle by almost symmetrically opening and closing a pair of semi-reflection hoods by a reflection hood opening and closing mechanism. CONSTITUTION:A reflection hood is divided almost symmetric with a stroboscope flashing tube 15 to obtain a pair of semi-reflecting hoods 21 and 22. The hoods 21 and 22 have interlocking projections 21d and 22d in the vicinity of opening/closing shafts 21a and 22a. These interlocking projections 21d and 22d are always in contact with each other due to the force of a tension spring 23, and serve to vertically open and close the upper semi-reflection hood 21 symmetric with the lower one when the lower semi-reflection hood 22 is opened and closed. Consequently, the opening and closing position can be controlled as designed to obtain an accurate irradiation angle.

Description

[Detailed description of the invention] "Technical field" The present invention relates to a variable illumination angle strobe device.

"Prior art and its problems" Conventional strobe devices that change the irradiation angle according to the focal length of the lens are of the type that changes the distance between the light emitting lamp (and reflector) and the condensing lens, and the type that changes the angle of the reflector. It is known as the type that causes The latter is more advantageous in terms of space than the former; for example, Japanese Patent Application Laid-Open No. 54-50324,
No. 62-218949.

This method has been proposed in Japanese Patent Application Laid-Open No. 1-147530. However, all of these basically deform a reflective umbrella made of flexible material to change the size of the opening and change the angle, and the amount of deformation of the reflective umbrella and The direction is difficult to control, and the elasticity of the flexible material changes over time, making it inaccurate and impractical.

``Object of the Invention'' The present invention aims to provide a strobe device that can more accurately control the angle of the reflector and control the angle of illumination in a variable illumination angle strobe device of the type that changes the angle of the reflector. purpose. Another object of the present invention is to obtain a variable illumination angle strobe device that can adjust the angle of a reflector using a small drive mechanism.

"Summary of the Invention" The present invention provides a strobe device equipped with a reflective umbrella that reflects light from a strobe light bulb toward an opening in front, in which the reflective umbrella is divided so that each can rotate independently. This was done based on the idea of obtaining a more accurate angle of the reflector by doing so.

The present invention provides a reflector that is divided approximately symmetrically about the center of a strobe light emitting tube into a pair of semi-reflectors, supports each of the pair of semi-reflectors so as to be rotatable around a rear axis, and It is characterized by the provision of a reflector opening/closing mechanism that opens and closes a pair of semi-reflectors in a substantially symmetrical manner.

According to this configuration, the reflector can be made of a substantially rigid body, so it is easy to manufacture, and the opening/closing position can be controlled as designed, so an accurate irradiation angle can be obtained.

The reflector opening/closing mechanism can be comprised of a means for opening and closing one of a pair of semi-reflectors, for example, and an interlocking mechanism that opens and closes the other reflector symmetrically when one of the reflectors is opened and closed.

Alternatively, a cam plate that is reciprocated may be provided with a cam groove that engages with a follower pin provided at a pair of semi-reflectors, and the reciprocating movement of the cam plate may open and close the pair of reflectors simultaneously.

At the rear of the strobe light tube, apart from a pair of semi-reflectors,
It is desirable to provide a fixed reflective member.

According to this fixed reflecting member, regardless of the open/closed position of the semi-reflectance, the light emitted from the rear of the strobe light emitting tube can be reflected forward, and the amount of emitted light can be effectively utilized.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. 1st A-I
Figure E shows a first embodiment of the invention.

The strobe housing 11 has left and right side plates 12 and a back plate 13, and a strobe light emitting tube (xenon tube) 15 is fixed onto the back plate 13 via a support projection 14.

The upper and lower parts of this arc tube 15 each have a semi-reflectance of 21.2.
2 is located. These semi-reflectances 21 and 22 have the same circular arc cross section in the axial direction of the arc tube 15, and at the rear thereof there are opening and closing shafts 21a and 22 parallel to the arc tube 15, respectively.
A is provided. On the other hand, a pair of upper and lower support elongated holes 16 and 17 that are long in the front and back direction are bored in the left and right side plates 12 of the strobe housing 11, respectively.
17, these opening/closing shafts 21a, 22a are fitted. Therefore, the semi-reflectance of 21.22 is equal to this support elongated hole 16.17.
It is movable back and forth along the opening/closing shafts 21a, 2.
It can be opened and closed centering on 2a.

These semi-reflectances 21 and 22 are spring-loaded on their outer surfaces by a tension spring 23 stretched between the protrusions 21c and 22c.
Always in the direction where the angle between the two is widened, that is, the semi-reflectivity is 21 and 2.
The exit aperture 24, which is formed by the distal end of the opening 2, is biased to rotate in a direction in which the exit opening 24 is enlarged. 25 in FIG. 1A is the exit aperture 2
4 is shown.

Moreover, this semi-reflectance 21.22 is the same as the opening/closing axis 21a and 2
An interlocking protrusion 21d and an interlocking protrusion 22d are provided near the interlocking protrusion 2a. These interlocking protrusions 21d and 22d are always in contact with each other due to the force of the tension spring 23, and when the lower semi-reflector 22 opens and closes (rotates around the opening/closing shaft 22a),
It functions to open and close the upper semi-reflectance 21 in a symmetrical manner up and down.

Reflective surfaces 21b and 22b on the inner surfaces of these semi-reflective umbrellas 21 and 22
, the reflective surfaces 12a of the inner surfaces of the left and right side plates 12, and the curved reflective surfaces 14b of the support protrusions 14, which have the same curvature as the arc tube 15 and are in contact therewith, are all processed into mirror surfaces. These mirror surfaces can be constructed by insert molding or plating of the mirror tube. Alternatively, a mirror tube may be fitted into the structure. The curved reflective surface 14b constitutes a fixed reflective surface that reflects the light emitted backward from the arc tube 15 forward.

Next, the reflector opening/closing mechanism 18 that opens and closes the pair of semi-reflective umbrellas 21 and 22 will be explained. One end of a slide lever 28 is pivotally attached to one side of the lower semi-reflective umbrella 22 with a pin 26. The slide lever 28 is supported by a guide elongated hole 29 and a guide bin 30 so as to be movable a certain distance in the vertical direction, and a rack 31 is formed at the lower end thereof. This rack 31 is connected to one sector gear 33a of a double sector gear 33 rotatably supported by a shaft 32.
The other sector gear 33b is meshed with the drive gear 34.

Therefore, when the drive gear 34 is rotated clockwise in FIG. 1C, the double sector gear 33
rotates counterclockwise around the shaft 32, and the slide lever 28 rises. Then, the slide lever 28 moves the bin 2.
The semi-reflective umbrella 22 pivoted by the opening/closing shaft 22
It rotates clockwise in FIG. 1A around point a. The rotation of the semi-reflective umbrella 22 is transmitted to the semi-reflective umbrella 21 via the interlocking protrusions 22d and 21d, and the semi-reflective umbrella 21 rotates symmetrically with the semi-reflective umbrella 22 in the direction of closing the exit opening 24 (the third 1B
figure). Therefore, light is emitted from the arc tube 15, and the reflecting surface 21b,
The angle of the strobe light reflected by 22b and emitted from the output aperture 24 becomes wider.

It becomes a wide irradiation state.

If the drive gear 34 is reversed from the state shown in FIG. 1B, the semi-reflective umbrellas 21 and 22 will eventually become the first
Return to the tele state shown in figure A. Of course, by controlling the rotation angle of the drive gear 34, it is possible to stop the semi-reflectors 21 and 22 at an intermediate position between FIG. 1A and FIG. 1B. Therefore, by controlling the rotation angle of the drive gear 34 according to the focal length of the photographic lens, it is possible to accurately match the focal length and the strobe irradiation angle. And semi-reflective umbrellas 21 and 2
No matter what the opening angle of 2 is, the light emitted backward from the arc tube 15 is reflected forward by the fixed curved reflecting surface 14b, so there is no wastage of light quantity. Also, the side plate 12
Since a has no mechanical relationship with the semi-reflective umbrellas 21 and 22, its configuration is easy.

It should be noted that the semi-reflective umbrellas 21 and 22 change their opening/closing shafts 21a during the transition from the telephoto state shown in FIG. 1A to the wide state shown in FIG. 1B.
and 22a move within the support elongated holes 16 and 17. Therefore, there is an advantage that the gap between the tips of the semi-reflective umbrellas 21 and 22 and the protector 25 can be kept almost constant, and the loss of light amount caused by light leaking from the gap can be minimized.

Figures 2A-2E illustrate a second embodiment of the invention. Compared to the first embodiment, this embodiment supports the side plate 12 of the strobe housing 11, which rotatably supports the opening/closing shaft 21a of the semi-reflective umbrella 21 and the opening/closing shaft 22a of the semi-reflective umbrella 22. The difference is that the holes are circular holes 16a and 17a, and the slide lever 28 and the semi-reflective umbrella 22 are engaged by a cam 40 and a pin 41. That is, the semi-reflective umbrellas 21 and 22 are connected to the opening/closing shaft 21
A bin 41 formed on the slide lever 28 and a cam 40 formed on the semi-reflective umbrella 22 control the movement of the slide lever 28, which only rotates around a and 22a and moves in a straight line.
The light is transmitted to the semi-reflective umbrella 22 which rotates. Of course, the relationship between cam 40 and bin 41 can be reversed.

The other parts are the same as those in the first embodiment, and the same parts are given the same reference numerals.

According to this embodiment, since the semi-reflectors 21 and 22 perform pure rotational motion, the mechanism is simple and has the advantage of being easy to control.

Furthermore, in the first and second embodiments, since the reflector opening/closing mechanism 18 is disposed at the lower part of the strobe housing 11, the lateral dimension can be reduced. Therefore, it is suitable when there is no extra space in the lateral direction.

Figures 3A-3E illustrate a third embodiment of the invention. This example has a half reflection amount of 21.22 compared to the second example.
The opening/closing mechanism 18 is different.

An arcuate surface 42 centered on the opening/closing shaft 22a is formed at the lower end of the semi-reflection amount 22, and a follower bin 43 is protruded from this arcuate surface 42.

On the other hand, in the lower part of the strobe housing 11, a cam plate 45 is supported so as to be movable laterally by a guide elongated hole 44a and a guide bin 44b. This cam plate 45 is formed with a circular arc surface 46 along the circular arc surface 42 having a semi-reflection amount of 22, and a cam groove 48 into which the follower bin 43 is fitted is formed in this circular arc surface 46. The cam plate 45 also has a transverse rack 49 in which a drive gear 50 meshes. The cam groove 48 opens and closes the semi-reflection amount 22 via the follower bin 43 when the cam plate 45 moves laterally.

The other parts are the same as those in the second embodiment, and the same parts are given the same reference numerals.

Accordingly, in this embodiment, when the drive gear 50 is driven in the forward and reverse directions, the cam plate 45 moves left and right.

Then, the semi-reflection amount 22 opens and closes via the cam groove 48 and the follower bin 43, and the semi-reflection amount 21 opens and closes symmetrically via the interlocking protrusions 22d and 21d. Therefore, basically the same effect as in the first to third embodiments can be obtained. Since the arcuate surface 42 of the semi-reflection amount 22 and the arcuate surface 46 of the cam plate 45 are circular arcs centered on the opening/closing shaft 22a, the cam plate 45 can move smoothly even if the semi-reflection amount 22 rotates. .

4A to 4D show a fourth embodiment of the present invention, which, like the third embodiment, uses a cam plate to
The half-reflections 21 and 22 are driven, and the feature is that the cam plate 52 drives the half-reflections 21 and 22 to open and close at the same time.

The cam plate 52 is located on the back side of the strobe housing 11 and has a horizontal guide elongated hole 53 and a guide bin 54.
It is supported so that it can move a certain distance in the lateral direction.

Further, the upper and lower ends of this cam plate 52 have a semi-reflection amount of 2
It is a circular arc portion 52a along the columnar portions 21f and 22f of 1 and 22, and no matter where the half-reflection amount 21.22 rotates,
This ensures smooth movement. A pair of cam grooves 55 and 56 are formed in the cam plate 52 and are located above and below the guide elongated hole 53 and are symmetrical with respect to the guide elongated hole 53. This cam plate 52 also has a transverse rack 57 in which a drive gear 58 meshes.

On the other hand, follower bins 21e and 22e that are directly fitted into the cam grooves 55 and 56 of the cam plate 52 are protruded from the semi-reflection quantities 21 and 22, respectively. When the cam plate 52 slides left and right, the cam grooves 55 and 56 generate a semi-reflection amount of 21.
22 symmetrically around the opening/closing shafts 21a and 22a. The other parts are the same as those in the second embodiment, and the same parts are given the same reference numerals.

Accordingly, in this embodiment, when the drive gear 58 is driven in the forward and reverse directions, the cam plate 52 moves left and right.

Then, the cam grooves 55 and 56 and the follower bin 21e.

Via 22e, the semi-reflectors 22 and 21 open and close simultaneously and symmetrically. That is, this embodiment differs from the first to third embodiments in which the movement of the semi-reflection amount 22 is transmitted to the semi-reflection amount 21,
Half-reflectors 21 and 22 are opened and closed at the same time. According to this embodiment, since the reflector opening/closing mechanism 18 can be configured on the back surface of the strobe housing 11, it is suitable especially when it is difficult to take up space on the left, right, and bottom sides.

In the above embodiment, the reflective surface 12a of the side plate 12 and the curved reflective surface 14b of the support protrusion 14 are constructed separately, but as shown in FIG. It is also possible to form a reflection block 60 that integrally includes a rear fixed reflection part 14b' located above the strobe 14 and a side reflection part 12a', and to incorporate this into the strobe housing 11.
The side reflection portion 12a' has a hole 61 through which the arc tube 15 is inserted.
to be drilled.

"Effects of the Invention" As described above, the variable illumination angle strobe device of the present invention has a reflective umbrella divided into a pair of semi-reflective umbrellas, each of which can be rotated around its rear axis. The umbrella itself can be constructed from a rigid material that is easy to manufacture.

By opening and closing the pair of semi-reflective umbrellas in a substantially symmetrical manner using the reflecting umbrella opening/closing mechanism, it is possible to accurately change the irradiation angle.

The reflective umbrella opening/closing mechanism is composed of a means for opening and closing one of a pair of semi-reflective umbrellas, and an interlocking mechanism that opens and closes the other reflective umbrella symmetrically when one of the semi-reflective umbrellas is opened and closed. Opening/closing means can be provided only on the vehicle side.

In addition, if this reflective umbrella opening/closing mechanism is composed of a cam plate that is reciprocated and a cam groove formed on the cam plate that engages with follower bins provided on the pair of semi-reflective umbrellas, the pair of semi-reflective umbrellas can be opened and closed. Can be opened and closed at the same time.

In addition, by providing a fixed reflective member separate from the pair of semi-reflective umbrellas at the rear of the strobe light bulb, the light emitted to the rear of the flash tube can be effectively reflected, regardless of the opening angle of the semi-reflective umbrellas.
It can lead you forward and increase your efficiency.

[Brief explanation of drawings]

1A-IE shows the first embodiment of the present invention, and FIGS. 1A and 1B are taken along line I-1 in FIG. 1E, which shows the tele beam angle and wide beam angle states, respectively. A cross-sectional view along
FIG. 1C is a front view, FIG. 1D is a side view, and FIG. 1E is a rear view. Figures 2A to 2E show a second embodiment of the present invention, and Figures 2A and 2B are shown along the lines ■-■ in Figure 2E, which show the tele illumination angle and wide illumination angle states, respectively. A cross-sectional view along
FIG. 2C is a front view, FIG. 2D is a side view, and FIG. 2E is a rear view. 3A to 3E show a third embodiment of the present invention, and FIGS. 3A and 3B show the tele illumination angle and wide illumination angle states, respectively. A cross-sectional view along
FIG. 3C is a front view, FIG. 3D is a side view, and FIG. 3E is a rear view. 4A to 4D show a fourth embodiment of the present invention, in which FIG. 4A is a sectional view taken along line IV-IV in FIG. 4B, FIG. 4B is a rear view, and FIG. 4C is a top view. Figure 4D is a side view. FIG. 5 is a perspective view showing still another embodiment of the present invention. Plate, 55.56...Cam groove, 57...Rack. 58... Drive gear.

Claims (4)

[Claims] (1) In a strobe device equipped with a reflector that reflects light from a strobe light bulb toward a front exit opening, the reflector is divided approximately symmetrically about the center of the strobe light bulb to form a pair of semi-reflective umbrellas. , The pair of semi-reflective umbrellas are each rotatably supported around their rear axes so that they can be opened and closed, and are equipped with a reflective umbrella opening/closing mechanism that opens and closes the pair of semi-reflective umbrellas in a substantially symmetrical manner. A strobe device with variable illumination angle. (2) In claim 1, the reflective umbrella opening/closing mechanism includes means for opening and closing one of the pair of semi-reflective umbrellas, and an interlocking mechanism that opens and closes the other reflective umbrella symmetrically when one of the reflective umbrellas is opened and closed. A variable beam angle strobe device. (3) In claim 1, the reflective umbrella opening/closing mechanism includes a cam plate that is reciprocated, and is formed on this cam plate;
A variable illumination angle strobe device is composed of a cam groove that engages with a follower pin provided on a pair of semi-reflective umbrellas, and the pair of semi-reflective umbrellas are opened and closed by the reciprocating operation of the cam plate. (4) The variable illumination angle strobe device according to any one of claims 1 to 3, wherein a fixed reflecting member other than the pair of semi-reflective umbrellas is provided at the rear of the strobe light emitting tube.