JP4397148B2 - Spotlight framing cutter mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spotlight used in a production space such as a theater stage or a television studio, and more particularly to an improvement in a framing cutter mechanism that adjusts an irradiation range of a projected image.
[0002]
[Prior art]
Conventionally, a framing cutter mechanism that adjusts the irradiation range of a projected image is provided between a light source unit that incorporates a light bulb in a lamp body and a lens tube that houses an imaging lens disposed in front of the light source unit. A spotlight is known.
[0003]
As this kind of framing cutter mechanism, two layers of gaps for inserting cutter blades are formed by superimposing three cutter support plates having a through-hole in the center, and two upper and lower cutter blades are used as the first gap. A two-slot, four-blade structure in which two left and right cutter blades are slidably inserted into the second gap is often used.
[0004]
[Problems to be solved by the invention]
According to the conventional framing cutter mechanism described above, since two cutter blades are inserted into one gap, there is a problem that the end of the cutter blades hits and the sliding range of the cutter blades is restricted.
In order to solve such problems, a four-slot four-blade structure in which five cutter support plates are stacked to form four layers of gaps into which cutter blades are inserted, and one cutter blade is inserted into one gap. If so, the sliding range of the cutter blade is not restricted.
However, the cutter blade used in this kind of framing cutter mechanism is easily deformed by the heat of the light, and since it needs to be replaced when used for a predetermined time, the cutter blade is inserted removably into the gap, Although there are two gaps in the two-slot four-blade structure described above, the insertion position of the cutter blade is not mistaken, but in the four-slot four-blade structure, there are four gaps and the insertion direction is also different from top to bottom, so There was a possibility that two cutter blades would be inserted in the same gap by mistake.
[0005]
The present invention has been made in view of the above-described conventional circumstances, and an object of the present invention is to provide a novel spot in which the sliding range of the cutter blade is not restricted and the cutter blade can be easily replaced. It is to provide a light framing cutter mechanism.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, in claim 1 of the present invention, four layers of gaps for inserting the cutter blades are formed between the adjacent cutter support plates by superimposing five cutter support plates having a through hole at the center. In addition to forming, four cutter blades arranged vertically and horizontally to surround the optical axis are slidably inserted into different gaps so as to cut the light passing through the through hole into an arbitrary frame shape The framing cutter mechanism, wherein the outer peripheral edge portion of each cutter support plate on the side where the cutter blade is inserted is curved outward to form an insertion guide portion that guides the insertion of the cutter blade into the gap. Features.
[0007]
When configured in this way, since it has a four-slot four-blade structure in which the cutter blades are inserted one by one into the gaps of the four layers, the sliding range of each cutter blade is not restricted, and each Since the cutter support plate is provided with the insertion guide portion for the cutter blade, it is possible to reduce the possibility that the cutter blade is erroneously inserted into the adjacent gap, and the cutter blade can be easily replaced.
[0008]
According to a second aspect of the present invention, there are provided restriction surfaces that restrict the left and right side edges of the substantially semicircular cutter portion of the cutter blade and restrict the extraction of the cutter blade from the gap at both ends in the circumferential direction of the insertion guide portion of each cutter support plate. In addition, a restriction surface of the insertion guide portion is inserted into the side edge of the operation handle of each cutter blade to expand the sliding range of the cutter blade, and a notch that enables the cutter blade to be pulled out from the gap is provided. It is characterized by that.
[0009]
When configured in this way, because the cutter blades are prevented from being pulled out by the restriction surfaces provided at both ends of the insertion guide portion, there is no risk that the cutter blades will fall off accidentally during the light projection, and If the regulating surface is inserted into the cut, the sliding range of the cutter blade is expanded by the length of the cut, and the cutter blade can be easily pulled out from the gap.
[0010]
In claim 3, by adjusting the degree of close contact between each cutter support plate and the cutter blade, a free position where each cutter blade is slidable within the gap, and a lock position that regulates sliding of each cutter blade; It is characterized by having a lock mechanism that can be switched freely.
[0011]
In such a configuration, if the lock mechanism is operated to the free position, the degree of close contact between each cutter support plate and the cutter blade is relaxed, and each cutter blade can be freely slid, and if the lock mechanism is switched to the lock position, The degree of close contact between each cutter support plate and the cutter blade is increased, and sliding of each cutter blade is restricted.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of a spotlight employing a framing cutter mechanism according to the present invention will be described with reference to the drawings. FIG. 1 is a side view showing an outline of the spotlight of this example. In FIG. 1, a is a lens in which one or a plurality of lenses are housed in front of a lamp house 1 incorporating a light source unit such as a light bulb 1a or a reflecting mirror 1b. A lamp body 2 is arranged, and a lamp body in which a framing cutter mechanism 4 is accommodated in a case 3 fixedly disposed between the lamp house 1 and the lens cylinder 2 is represented. The tool b is supported so that the tilt angle can be adjusted.
[0013]
As shown in FIG. 2, the framing cutter mechanism 4 includes five cutter support plates 5a, 5b, 5c, 5d, and 5e having a through-hole 5 'opened in the central portion, and adjacent cutter support plates. 4 layers of gaps 6a, 6b, 6c, 6d into which the cutter blades are inserted are formed, and four cutter blades 7a, 7b, 7c, 7d arranged to surround the optical axis L are separated into different gaps 6a. , 6b, 6c, 6d are slidably inserted, and light passing through the through-hole 5 'is cut into an arbitrary frame shape.
The cutter support plates 5a to 5e and the cutter blades 7a to 7d are accommodated between the holding plates 8a and 8b before and after the through-hole 8 'is opened at the center.
[0014]
The front and rear holding plates 8a and 8b are fixed inside the case 3. The flanges 9a and 9b are bent at equal intervals at four locations on the outer periphery, and the opposing flanges 9a and 9b are overlapped. By fastening with the screw 10, the cutter support plates 5a to 5e, the cutter blades 7a to 7d, and the lock mechanism 20 are held between the front and rear holding plates 8a and 8b.
[0015]
Each of the cutter blades 7a to 7d is formed by continuously connecting a cutter blade operation handle 72 along the center of a substantially semicircular cutter portion 71, and a side edge of the operation handle 72 is described later. A notch 73 is formed.
[0016]
Concave portions 11 that prevent the rotation of the respective cutter support plates 5a to 5e are formed by engaging the flanges 9a and 9b at four locations on the outer periphery of each of the cutter support plates 5a to 5e.
[0017]
Further, the outer peripheral edge portion of each cutter support plate 5a to 5d on the side where the cutter blades 7a to 7d are inserted is slightly protruded from the other portions, and the outer edges of the protruding portions 12a, 12b, 12c and 12d are cut by the cutter. Insertion guide portions 13a, 13b, 13c, and 13d are formed that are curved outward regardless of the blade insertion to guide the insertion of the cutter blades 7a to 7d into the gaps 6a to 6d.
[0018]
Specifically, as shown in FIGS. 3 and 4, the cutter blade 7a is inserted into the gap 6a between the cutter support plates 5a and 5b from above, but the outer peripheral edge portion on the upper side of the cutter support plate 5a is In addition to projecting slightly from the other portions, the outer edge of the projecting portion 12a is curved toward the front holding plate 8a to form the insertion guide portion 13a so that the cutter blade 7a can be easily inserted into the gap 6a. It has become.
Similarly, the cutter blade 7b is inserted into the gap 6b between the cutter support plates 5b and 5c from below, but the outer peripheral edge portion on the lower side of the cutter support plate 5b slightly protrudes from the other portions, An insertion guide portion 13b is formed by bending the outer edge of the protruding portion 12b toward the cutter support plate 5a, so that the cutter blade 7b can be easily inserted into the gap 6b.
Similarly, the cutter blade 7c is inserted into the gap 6c between the cutter support plates 5c and 5d from the right side. The outer peripheral edge portion on the right side of the cutter support plate 5c is slightly protruded from the other portions, and An insertion guide portion 13c is formed by bending the outer edge of the protruding portion 12c toward the cutter support plate 5b, so that the cutter blade 7c can be easily inserted into the gap 6c.
Similarly, the cutter blade 7d is inserted into the gap 6d between the cutter support plates 5d and 5e from the left side. The outer peripheral edge portion on the left side of the cutter support plate 5d is slightly protruded from the other portions, and An insertion guide portion 13d is formed by bending the outer edge of the protruding portion 12d toward the cutter support plate 5c, so that the cutter blade 7d can be easily inserted into the gap 6d.
[0019]
Further, as shown in FIG. 5 (a), the recesses 11 and 11 are located at the circumferential ends of the insertion guide portions 13a to 13d formed on the cutter support plates 5a to 5d. The flange 9a that engages with the blade 11 functions as a restricting surface that restricts the extraction of the cutter blades 7a to 7d from the gaps 6a to 6d when the left and right edges 71a and 71a of the cutter portion 71 of the cutter blades 7a to 7d are caught. (See FIG. 5 (b)).
[0020]
On the other hand, any one of the restriction surfaces (flange 9a) at both ends of the insertion guide portions 13a to 13d is inserted into the side edge of the operation handle 72 of each cutter blade 7a to 7d, and the cutter blades 7a to 7d slide. A notch 73 is formed to enlarge the range and enable the cutter blades 7a to 7d to be pulled out from the gaps 6a to 6d (see FIGS. 6 (a) to (e)).
[0021]
Between the cutter support plate 5a and the front holding plate 8a, a lock mechanism 20 including an engaging plate 21, a fixed plate 22, and a rotating plate 23 is provided.
[0022]
The locking plate 21 is provided with concave portions 21a with which the flange 8a engages at four locations on the outer periphery so as to be non-rotatably in close contact with the holding plate 8a. Claws 21c that restrict the rotation of the fixing plate 22 are formed in four raised portions around the periphery of 21b.
[0023]
The fixing plate 22 has recesses 22a engaged with the flange 8a at four locations on the outer periphery, and opens holes 22c into which the claws 21c are inserted at four locations around the through hole 22b opened at the center. The locking plate 21 is in close contact with the non-rotatable state. In addition, first mountain springs 22d that protrude toward the rotating plate 23 are formed in a cut-and-raised shape at four locations around the through-hole 22b.
[0024]
The rotary plate 23 is rotatably held between the fixed plate 22 and the cutter support plate 5a. The second rotary plate 23 protrudes toward the fixed plate 22 at four locations around the through hole 23a opened in the center. Are formed in a cut-and-raised shape. Further, on the outer periphery of the rotating plate 23, a convex portion 23d to which a handle 23c for operation for rotating the rotating plate 23 is fixed is integrally formed.
[0025]
The position of each mountain-shaped leaf spring 23b provided on the rotating plate 23 can be appropriately adjusted by rotating the rotating plate 23 with the handle 23c, and the position of these mountain-shaped leaf springs 23b can be arbitrarily adjusted. Thus, the cutter blades 7a to 7d can be switched to a free position where the cutter blades 7a to 7d are slidable within the gaps 6a to 6d and a lock position for restricting the sliding of the cutter blades 7a to 7d.
That is, when these mountain-shaped plate springs 23b are in positions where they interfere with the respective mountain-shaped plate springs 22d provided on the fixed plate 22 (see FIG. 7 (a)), the rotating plate 23 has the cutter blades 7a to 7d. And each cutter support plate 5a-5e is pressed to the holding plate 8b direction, each cutter blade 7a-7d is firmly clamped by each cutter support plate 5a-5e, and the sliding is controlled. On the other hand, when each mountain-shaped leaf spring 23b is in a position where it does not interfere with each mountain-shaped leaf spring 22d of the fixed plate 22 (see FIG. 7B), the pressing force is released and each cutter blade 7a-7d. And the close state of each cutter support plate 5a-5e becomes loose, and each cutter blade 7a-7d becomes slidable within the said clearance gaps 6a-6d.
[0026]
The framing cutter mechanism of this example having the above-described configuration is provided with four blade gaps 6a to 6d formed by overlapping five cutter support plates 5a to 5e. Since it has a four-slot and four-blade structure to be inserted, each cutter blade 7a to 7d is freely slid within the gaps 6a to 6d, and the light emitted from the light source part and passing through the through-hole 5 ' Can be cut into shapes. Moreover, since each of the cutter support plates 5a to 5d is provided with the insertion guide portions 13a to 13d whose outer peripheral edges are partially curved outward, the cutter blades 7a to 7d are erroneously inserted into the adjacent gaps. It can be easily inserted and used in the appropriate gaps 6a to 6d.
[0027]
Further, the regulation surfaces (flange 9a or 9b) provided at both ends of the insertion guide portions 13a to 13d prevent the cutter blades 7a to 7d inserted into the gaps 6a to 6d from being pulled out. There is no fear that the blades 7a to 7d fall off. In addition, if the regulation surface (flange 9a or 9b) is inserted into the notch 73, the sliding range of the cutter blades 7a to 7d is enlarged by the length of the notch 73, and the cutter blades 7a to 7d are separated from the gaps 6a to 6d. Can be easily pulled out from.
[0028]
Further, if the rotating plate 23 is rotated to the free position, the close contact between the cutter support plates 5a to 5d and the cutter blades 7a to 7d is relaxed, and the cutter blades 7a to 7d can be freely slid. If 23 is rotated to the lock position, the degree of close contact between the cutter support plates 5a to 5d and the cutter blades 7a to 7d increases, and the sliding of the cutter blades 7a to 7d is restricted.
[0029]
As mentioned above, although an example of the embodiment of the spotlight which adopted the framing cutter mechanism concerning the present invention was explained with reference to drawings, the present invention is not limited to the example of illustration, and each claim of a claim Can be applied to various embodiments within the scope of the technical idea described in.
[0030]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
(Claim 1)
Since it has a 4-slot 4-blade structure, there is no restriction on sliding operation of each cutter blade, and the irradiation range of the projected image can be adjusted widely. Moreover, since it has the insertion guide part for inserting each cutter blade | wing into a clearance gap, a cutter blade | wing can be replaced | exchanged easily.
[0031]
In addition, because the restriction surfaces are provided at both ends of the insertion guide part, it is possible to prevent the possibility that the cutter blade will accidentally fall out of the gap during light projection, and to adjust the irradiation range of the projected image with peace of mind. Can do. Furthermore , by inserting the regulating surface into the notch provided in the handle for operating the cutter blade, the sliding range of the cutter blade can be expanded by the length of the notch, and the cutter blade can be easily pulled out from the gap. .
[0032]
(Claim 2 )
Equipped with a lock mechanism that can be switched between a lock position that restricts the sliding of each cutter blade and a free position that releases the restriction. Various projection operations such as projection angle adjustment, focus adjustment, zoom adjustment, and the like can be easily performed.
[Brief description of the drawings]
FIG. 1 is a simplified side view showing an example of a spotlight equipped with a framing cutter mechanism according to the present invention.
FIG. 2 is an exploded perspective view showing an example of an embodiment of a framing cutter mechanism according to the present invention.
FIG. 3 is an enlarged perspective view of a state in which a cutter blade is inserted into a gap between cutter support plates.
FIG. 4 is a cross-sectional view of a cutter support plate.
FIG. 5 is an operation diagram showing a state in which the cutter blade is prevented from being pulled out.
FIG. 6 is an operation diagram illustrating a state in which the cutter blade can be pulled out.
FIG. 7 is a cross-sectional view of a main part of a fixed plate and a rotating plate showing a locked state and a free state in the lock mechanism.
[Explanation of symbols]
a: Lamp 1: Lamp house
1a: Light bulb
1b: Reflector 2: Lens tube 4: Framing cutter mechanism
5a to 5e: Cutter support plate
6a to 6d: gap
7a-7d: Cutter blade
71: Cutter section
72: Operation handle
73: Notch
9a, 9b: Flange (regulatory surface)
13a to 13d: Insertion guide
20: Lock mechanism L: Optical axis

Claims (2)

Five cutter support plates with a through hole in the center are overlapped, and adjacent cutter support plates form four layers of gaps for inserting cutter blades, and are arranged vertically and horizontally to surround the optical axis. A framing cutter mechanism in which four cutter blades are slidably inserted into different gaps to cut light passing through the through hole into an arbitrary frame shape,
Curving the outer peripheral edge of each cutter support plate on the side where the cutter blade is inserted, regardless of whether the cutter blade is inserted, to form an insertion guide portion that guides the insertion of the cutter blade into the gap,
At the both ends in the circumferential direction of the insertion guide part in each cutter support plate, there are provided restriction surfaces that restrict the left and right edges of the substantially semicircular cutter part of the cutter blade to restrict the extraction of the cutter blade from the gap, and each cutter blade The side of the handle for operation is provided with a notch that allows the restriction surface of the insertion guide portion to be inserted to expand the sliding range of the cutter blade and allow the cutter blade to be pulled out from the gap. Spotlight framing cutter mechanism. A lock that can be switched between a free position in which each cutter blade can slide within the gap and a lock position that regulates the sliding of each cutter blade by adjusting the closeness between each cutter support plate and the cutter blade. The spotlight framing cutter mechanism according to claim 1, further comprising a mechanism.

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