JPH0743849Y2 - Iris shutter for lighting equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention occupies the projection light path of a lighting device such as a spotlight used for stage lighting, outdoor lighting, indoor lighting, etc. The present invention relates to an iris shutter that is clearly defined.

[Conventional technology and problems]

2. Description of the Related Art Conventionally, an iris shutter of an illuminating device has a substrate having a light projecting hole at the center, a base end part pivotally fixed around the light projecting hole of the substrate, and a pin at the tip part. Plural pieces (usually about 8 to 24 pieces) arranged so as to rotate at the same time so as to concentrically cover the light holes from the outer circumference toward the center.
Shutter blades and guide holes with which the pins of the shutter blades are engaged at predetermined intervals, and between the closed position and the open position (usually 60 ° to 120 °) with respect to the substrate with the light projecting hole as the center.
And about) an operating plate provided so as to reciprocally rotate to open and close the shutter blades.

By the way, as shown in FIG. 6, the guide holes of the actuating plate in the conventional iris shutter are straight elongated holes arranged radially, so when the actuating plate is rotated and the blades are closed, all The vanes gathered at the same distance from the center and could not be completely closed due to the thickness of the vanes. Therefore, in order to completely close it, in the conventional product, an auxiliary shutter was provided to close the last remaining hole.

[Means for solving problems]

Therefore, the present invention comprises a substrate having a light projecting hole at the center, a base end part pivotally attached to the periphery of the light projecting hole of the substrate, and a pin at the tip part. A plurality of shutter blades arranged so as to rotate concentrically from the outer periphery toward the center at the same time, and guide holes with which the pins of the shutter blade engage are provided at predetermined intervals, and with respect to the substrate. The projection contour is formed by occupying the projection light path of the illuminating device, which includes a working plate provided to open and close the shutter blade by reciprocally rotating between the closed position and the open position around the projection hole. In the iris shutter that is clearly defined, the shape of the guide hole with which the pin engages is formed into a plurality of types of a leading guide hole and a lagging guide hole, and the operating plate is rotated from the open position to the closed position. When a small number of shutter blades whose pins are guided by the preceding guide holes are closed The illumination device is configured to close the shutter in a state in which a large number of shutter blades whose pins are guided by the delay guide holes are occupying positions away from the center of the light projecting hole when the shutter is rotated to the stationary position. This iris shutter is intended to be provided.

[Action]

Similar to the conventional iris shutter, when all the blades overlap and close to the operating limit when the operating plate is closed in the closing direction, two or three pins guided by the pin in the preceding guide hole When a small number of shutter blades rotate to the closed position, the remaining many shutter blades whose pins are guided by the delay guide holes stop or reduce the movement toward the center. Occupied by
Thus, the shutter can be completely closed by the small number of blades of 2 to 3.

〔Example〕

The present invention will be described in detail with reference to the embodiments shown below.
In FIG. 1, reference numeral 1 denotes a substrate having a circular light projecting hole 2 in the center, and the substrate 1 is concentrically covered with the light projecting hole 2. In the case of an embodiment, 12 shutter blades 3 are provided. It is rotatably attached to the base end by a pivot 4 so as to be rotatable at equal intervals. Each shutter blade 3 has a shape in which an inner peripheral edge 5 of the shutter blade 3 overlaps with each other to cover the light projecting hole 2 from the outer periphery in a substantially circular shape. Also,
The tip of the shutter blade 3 is located on the outer circumference of the light projecting hole 2 and has a pin 6. Reference numeral 7 is a hollow disk-shaped actuating plate having a light projecting hole 2 in the center, and an operating handle 8 is integrally provided. As shown in FIG. 2, the operating plate 7 has twelve guide holes 9 and 10 corresponding to the number of the shutter blades 3. Of these, the three guide holes 10 at 120 ° intervals are provided. , The other 9
While each guide hole 9 is bent in a V shape, it is provided as a linear elongated hole. Guide hole 10
Are radially provided in the radial direction of the disc, whereas the guide hole 9 is composed of a linear portion 9a directed in the radial direction and a bent portion 9b bent in the anti-closing direction (opening direction). , The shutter blades 3 in these guide holes 9 and 10.
The pins 6 are sequentially fitted. The operating plate 7 is mounted on the substrate 1 by an inner guide plate 11, an outer guide plate 12 and an outer guide plate 13 so as to rotate smoothly around the light projecting hole 2.

In the above configuration, in FIG. 1, the handle 8 of the operating plate 7 is I
The shutter is fully open when it is in position 3, half open when it is in position II, and fully closed when it is in position III. FIG. 3 shows a state where the shutter is fully opened. From this state, when the operating plate 7 is rotated clockwise to close the shutter blade 3 from the state where the shutter is half opened, the pin 6 of the blade operates. The guide holes 9 and 10 of the plate move toward the center at first,
While rotating toward the fully closed state in the figure, it moves outwards in the opposite direction. When the pin 6 of the shutter blade 3 comes to the curved portion 9b from the straight portion 9a of the guide hole 9, the movement of the blade 3 toward the center of the light projecting hole 2 thereafter becomes that of the linear guide hole 10. Compared with the movement of the blades, in the state shown in FIG. 5, the three blades 3 (indicated by A in the figure) guided by the linear guide holes 10 gather at the center O of the light projecting hole 2.
The vanes 3 guided by the remaining "dogleg" holes 9 are only off-center. Therefore, the guide hole 9 constitutes a delay guide hole according to the present invention, and
10 constitutes the preceding guide hole. In this way, since only the three blades having the leading guide holes 10 are located at the center, they can be completely closed without difficulty. On the other hand, in the conventional iris shutter, as shown in FIG. 6, all the guide holes 10 of the actuating plate 7 are linear and elongated holes, so that all 12 shutter blades project light at the same time. They gather toward the center O of the hole 2 and overlap at the operation limit position so that they cannot move and cannot be fully closed.

In the illustrated embodiment of the present invention, the linear guide hole 10 is set to 3
Although the guide holes 9 are arranged at equal angular intervals and the rest are all the same V-shaped guide hole 9, if the number of linear guide holes 10 is a decimal number that can be collected in the center O, another The number can be set to be a number, and the same effect can be obtained even if the arrangement is not performed at the equal angular intervals. It is also possible that the holes in the shape of the "V" are not all the same and there are several kinds, and the delay of the operation of the blade is changed for each blade.

〔effect〕

As described above, according to the iris shutter of the lighting device of the present invention, the substrate 1 having the light projecting hole 2 at the center, and the substrate 1
The base end portion is pivotally attached around the light emitting hole 2 of the
And has the pin 6 and holds the light projecting hole 2 from the outer periphery to the center O
A plurality of shutter blades 3 arranged so as to rotate concentrically toward each other and a pin 6 of the shutter blade 3 are fully closed from a fully open position I to a half open position II. Equipped with guide holes 9 and 10 which are slidably engaged in this order in the order of the middle portion, the base portion, the middle portion, and the front portion along the outer radial direction of the light projecting hole 2 while rotating in the direction of the position III at predetermined intervals. Then
Fully open position I and fully closed position with respect to the substrate 1 centering on the light projection hole 2
III, and an integral operating plate 7 provided to open and close the shutter blades 3 to open and close the shutter blades 3 and occupy the projection light path of the lighting device to sharply define the projection contour. In the iris shutter, a guide hole 9 with which the pin 6 is engaged,
The shape of 10 is a small number of guide holes 10 in which the base portion, the intermediate portion, and the tip portion are linear, and the bent portion in which the intermediate portion to the tip portion is bent in the anti-closing direction with respect to the straight portion 9a from the base portion to the intermediate portion. When the operating plate 7 is rotated from the fully open position I to the fully closed position III, the pin 6 is linearly guided by the preceding guide hole 10 when it is formed into a plurality of types with a large number of delay guide holes 9 as 9b. While a small number of shutter blades 3 are interlocked with the fully closed position III, a large number of shutter blades whose pins 6 are guided to a bent portion 9b in which the middle portion of the delay guide hole 9 is bent in the anti-closed direction. The iris shutter of the illuminating device is configured so that the shutter is closed in a state in which the shutter 3 is stopped at a position apart from the center O of the light projecting hole 2 in the half-open position direction. Integrated operating plate 7 from fully open position I to fully closed position III When the shutter blades 3 move, the majority of the shutter blades 3 that overlap each other due to the rotation in the fully closing direction and generate a large rotation resistance have a bent portion in which the tip portion from the middle portion of the delay guide hole 9 bends in the anti-closing direction. While the pin 6 is guided by 9b and stopped at a position apart from the center O of the light projecting hole 2 in the half-open position direction, a small number of shutter blades 3 linearly guided by the pin 6 are guided by the preceding guide hole 10. Closed position II
Since it will be lightly linked to I, the shutter operation blades can be smoothly opened and closed with an integrated operating plate for a complex structure with a large structure because the conventional two pairs of diaphragm operating plates are differential. The effect is to provide an iris shutter for a possible lighting device.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a part of an iris shutter of an illumination device according to the present invention with a part cut away, and FIG. 2 is a schematic front view showing the main part of the iris shutter according to the present invention. 3, FIG. 3 is a schematic front view showing one operation mode of the main part, FIG. 4 is a schematic front view showing another operation mode of the main part, and FIG. FIG. 6 is a schematic front view showing an operation mode, and FIG. 6 is a schematic front view showing an embodiment of a conventional iris shutter. 1 ...... Substrate 2 ...... Projection hole 3 ...... Shutter blade 4 ...... Axis 5 ...... Shutter blade inner peripheral edge 5 6 ...... Pin 7 ...... Operating plate 8 ...... Operation handle 9 ...... Delay guide hole 10 ... … Leading guide hole

Claims (1)

[Scope of utility model registration request] 1. A substrate 1 having a light projecting hole 2 in the center, a base end portion pivotally mounted around the light projecting hole 2 of the substrate 1, and a pin 6 provided at the front end portion. A plurality of shutter blades 3 arranged to simultaneously rotate so as to concentrically cover the light projecting hole 2 from the outer periphery toward the center O, and the pin 6 of the shutter blade 3 fully opens the blade 3. Position I
From the semi-open position II to the fully closed position III, the guide hole is slidably engaged in this order along the radial direction of the outer periphery of the light projecting hole 2 in the order of the intermediate portion, the base portion, the intermediate portion, and the front portion. 9 and 10 are provided at predetermined intervals, and are provided so as to open and close the shutter blades 3 by reciprocally rotating around the light projecting hole 2 with respect to the substrate 1 between a fully open position I and a fully closed position III. In an iris shutter which is composed of an integral actuating plate 7 and which occupies a light projection light path of a lighting device to sharply define a light projection contour, the shape of guide holes 9 and 10 with which the pin 6 is engaged is base,
A small number of leading guide holes 10 in which the middle part and the tip part are linear,
The actuating plate 7 is formed into a plurality of types by forming a plurality of types of delay guide holes 9 which are bent portions 9b in which the front portion bends in the anti-closing direction with respect to the straight portion 9a from the base portion to the middle portion. When rotating from I to the fully closed position III, the preceding guide hole 10
A small number of shutter blades 3 whose pins 6 are linearly guided
Is linked to the fully closed position III, while the delay guide hole 9
A large number of shutter blades 3 whose pins 6 are guided are bent at a bent portion 9b in which the front portion is bent in the anti-closing direction from the middle portion of
An iris shutter of an illuminating device, characterized in that the shutter is closed in a state in which the shutter is stopped at a position apart from the center O in the half-open position direction.