JP4074787B2 - Spotlight bulb adjustment 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 light bulb position adjusting structure and a socket replacement structure in the spotlight.
[0002]
[Prior art]
Conventionally, a spotlight in which a light bulb, a reflector, a light bulb position adjusting means, and the like are incorporated in the rear part of the lamp body is known.
The reflector has a substantially rotating parabolic shape formed by rotating a parabolic curve, an elliptical curve, or a free curve, etc. by 360 degrees, and the rear side of the lamp body with respect to the light bulb insertion hole provided near the top of the rear end. The light emitting part (glass bulb) of the bulb is inserted.
The light bulb is attached to a socket attached to the front surface of a cover that is detachably attached to the rear opening of the lamp house so that the light center of the light emitter (filament) is located near the focal point of the reflector. .
When the cover is removed from the lamp house, the socket attached to the front surface of the cover and the light bulb attached to the socket are taken out together, and the light bulb and the socket are exchanged in this state.
[0003]
As a light bulb, a halogen light bulb sealed in a glass bulb to hold a light emitter (tungsten filament) in a predetermined position is generally used. However, it is possible to manufacture the light emitter so that the light emitter is held in a predetermined position with high accuracy. Since it is difficult, it is inevitable that the light center position of the light bulb is deviated by several millimeters from the reference value. However, in order to maintain high performance as a spotlight, the light center position of the bulb with respect to the focal point is an important optical element in the design of the reflector, so the bulb is moved back and forth and up and down along the optical axis. The position adjusting means is disposed between the cover and the socket.
[0004]
[Problems to be solved by the invention]
By the way, as the conventional bulb position adjusting means, for example, the bulb is moved back and forth along the optical axis by a feed screw mechanism, and the feed screw is tilted with respect to the optical axis, and then locked at an appropriate position in the left and right direction, A pseudo adjustment method for correcting the position of the light bulb in the vertical direction is used. Not only is the operation troublesome, but also the degree of tilting the feed screw depends largely on the feeling, and there are problems such as requiring skill.
[0005]
Further, conventionally, the power cord connected to the socket attached to the front surface of the cover is wired inside the lamp house through the through hole provided in the cover. It was necessary to disassemble and remove the power cord, and the socket replacement was troublesome.
[0006]
The present invention has been made in view of the above-described conventional circumstances, and the object of the present invention is to ensure that the position of the light bulb can be adjusted with a simple operation. The purpose of this is to make it possible to easily replace the socket disposed in the light bulb position adjusting means.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a cutter mechanism for cutting a light projection into an arbitrary frame shape in front of a lamp house including a light bulb, a reflector, a light bulb position adjusting means, etc. And a light bulb adjustment mechanism in a spotlight in which a lamp body is configured by disposing a lens tube containing one or more lenses in front of the cutter mechanism portion,
The light bulb position adjusting means includes a cover that is detachably attached to the rear opening of the lamp house, a base that is held back and forth on the front side of the cover, and a vertical movement that is movable up and down on the front side of the base. It consists of a socket mounting plate that is held at the front and the socket part is mounted on the front surface,
A screw shaft projecting on the rear surface of the base is screwed into an operation knob provided on the rear surface side of the cover so as to be rotatable, and the base moves back and forth along the optical axis by the rotation of the operation knob. In addition, the socket mounting plate is provided with a long hole for inserting an eccentric cam shaft that is rotatably held on a base, and the socket mounting plate is configured to move up and down by the rotation of the eccentric cam shaft. It is characterized by.
[0008]
In such a configuration, when the operation knob on the rear surface of the lamp house is rotated, the base is moved back and forth by the screw shaft screwed into the operation knob, and the socket portion is moved back and forth together with the base. Thus, it is possible to perform alignment in the front-rear direction of the bulb. Moreover, when a tool such as a screwdriver is inserted from the rear surface of the lamp house and the eccentric cam shaft is rotated, the socket mounting plate moves up and down through the long hole into which the eccentric cam shaft is inserted, and together with this socket mounting plate The socket part can be moved up and down to align the bulb in the vertical direction.
[0009]
In claim 2 of the present invention, the socket part is composed of a socket case that is detachably attached to the front surface of the socket mounting plate, and a socket that is covered with the socket case and fixed to the front surface of the socket mounting plate. The power cord connected to the socket is configured to be wired inside the lamp house through a notch provided in the outer peripheral edge of the cover.
[0010]
In this case, if the socket case and the socket are removed from the socket mounting plate and the power cord is removed from the notch, the socket can be replaced without disassembling the bulb position adjusting means.
[0011]
According to a third aspect of the present invention, the power cord includes a cord presser for fixing the notch passing portion of the power cord to the cover, and the cord presser has a lower concave groove into which the lower half of the peripheral surface of the power cord is fitted. It consists of a front presser plate and a rear presser plate having an upper concave groove into which the upper half of the circumferential surface of the power cord is fitted, and the upper and lower concave grooves are overlapped with the front and rear press plates to The notch passing portion is clamped and the front and rear press plates are detachably fixed to the rear surface of the cover.
[0012]
In this case, the power cord can be fixed to the cutout of the cover by the cord presser to prevent the possibility that the power cord is accidentally pulled out.
[0013]
In claim 4, on both the front and rear sides of the front presser plate, the convex portion provided with the lower concave groove is projected, and one lower concave groove is formed so that a large-diameter power cord can be inserted therein. The other lower concave groove is formed so that a small-diameter power cord can be inserted, and either the front or rear surface of the front pressing plate is selected as the overlapping surface with the rear pressing plate according to the diameter dimension of the power cord. It is characterized by having comprised so that it may obtain.
[0014]
In this case, select either the front or rear lower groove of the front retainer plate according to the diameter of the power cord, and superimpose the selected surface with the lower groove on the rear retainer plate. A power cord having a diameter or a small diameter can be securely held between the upper and lower concave grooves.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of a spotlight 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 the present example. In FIG. 1A, a cutter mechanism portion 2 for cutting light projection into an arbitrary frame shape is disposed in front of the lamp house 1 and the cutter mechanism. 2 represents a lamp body in which a lens tube 3 containing a lens is disposed in front of the portion 2, and the lamp body a is supported by a lamp body support tool b so that the tilt angle thereof can be adjusted. Yes.
[0016]
The lamp house 1 incorporates a light bulb 4, a reflector 5, and the like, and a light bulb position adjusting means c is detachably attached to the rear opening 1a.
The reflector 5 is fixed to the rear part of the lamp house 1 so that the front opening 5a faces the cutter mechanism part 2, and the light emitting part of the light bulb 4 from the rear surface side of the lamp house 1 is inserted into the light bulb insertion hole 5b near the top of the rear end. (Glass bulb) 4a is inserted.
[0017]
The light bulb 4 is a halogen light bulb, a discharge lamp light bulb, or the like, and is detachably attached to a socket portion d disposed on the front side of the light bulb position adjusting means c attached to the rear portion of the lamp house 1.
[0018]
As shown in FIGS. 2 to 6, the light bulb position adjusting means c includes a cover 11 that is detachably attached to the rear opening 1 a of the lamp house 1 by a fixing means 10 such as a knurled screw, and a front surface of the cover 11. The base 12 is mounted so as to be movable back and forth along the optical axis L, and the socket mounting plate 13 is mounted on the front surface of the base 12 so as to be movable up and down.
[0019]
The cover 11 is formed so that a collar portion 11b is provided around the outer periphery of the cover plate 11a so as to be detachably fitted to the rear opening 1a of the lamp house 1, and a guide column 11c is provided at an appropriate position on the front surface of the cover plate 11a. The base 12 is urged forward by a spring 11d that protrudes and is externally mounted on each guide column 11c.
[0020]
The base 12 is a plate-like member formed with an outer shape that fits loosely in the portion surrounded by the flange portion 11b, and is a screw shaft that is loosely inserted into a through hole 11e opened in the center of the lid plate 11a on the rear surface side. 12a is protruded, the tip of the screw shaft 12a protrudes to the rear surface side of the cover 11, the operation knob 14 is screwed into the tip, and the square portion covers the tip of the guide post 11c and springs. A recess 12b that receives the urging force of 11d is formed, and the base 12 is slid back and forth by the turning operation of the operation knob 14.
[0021]
The socket mounting plate 13 is loaded between the left and right guides 15a and 15b protruding from the front surface of the base 12, and is pressed against the base 12 by an inverted U-shaped leaf spring 16 attached to the front surface of the base 12. Thus, the plate-like member is supported on the front surface of the base 12 so as to be movable up and down, and slides up and down with the eccentric rotation of the eccentric cam shaft 18 inserted into the elongated hole 17 provided in the upper portion thereof and extending in the substantially horizontal direction. It has become.
[0022]
The eccentric cam shaft 18 is connected to the front side eccentric position of the head 20 facing the opening 19 opened in the base 12, and a tool such as a screwdriver is inserted into a cross groove 20 a provided in the head 20. It is designed to rotate.
[0023]
The socket portion d includes a socket case 21 that is detachably attached to the front surface of the socket mounting plate 13 with screws 50 and a socket 22 that is covered with the socket case 21 and fixed to the front surface of the socket mounting plate 13. A power cord 23 is connected to the.
[0024]
The power cord 23 is wired in the lamp house 1 through an inverted U-shaped notch 24 provided upward from the lower peripheral edge of the cover 11. Further, the front end portion 23a on the socket connection side of the power cord 23 is sandwiched between the front and rear cord clips 25a and 25b, and the cord clips 25a and 25b are removably fastened to the rear surface of the socket case 21 with screws 26, Pull-out prevention is achieved.
[0025]
A portion 23b of the power cord 23 passing through the notch 24 is fixed to the cover 11 by a cord presser 30 including front and rear pressers 31 and 32 as shown in FIG.
The front presser plate 31 is removably attached to the rear surface of the cover 11 with a screw 33 and covers the periphery of the notch 24. A notch 31b communicating with the notch 24 is formed from the upper edge to the center. Protrusions 31c and 31c that are formed over the vicinity and can be loosely inserted into the notch 24 are provided on both front and rear surfaces of the plate 31a below the notch 31b. The upper surfaces of the convex portions 31c are inclined so as to incline downward toward the tip, and lower concave grooves 31d and 31e into which the lower half of the peripheral surface of the power cord 23 is fitted are formed in the inclined surface portions. .
[0026]
One lower concave groove 31d is recessed with a dimension capable of fitting a large-diameter power cord, and the other lower concave groove 31e is recessed with a dimension capable of accommodating a small-diameter power cord. Either one of the lower concave grooves 31d and 31e can be selected and used in accordance with the diameter dimension of 23.
[0027]
The rear presser plate 32 is attached to the cover 11 together with the plate portion 31a by the above-described screw 33 so as to overlap the front presser plate 31, and the notch 32a into which the convex portion 31c can be loosely inserted is centered from the lower edge. The inner surface of the upper end portion of the notch 32a is inclined so as to incline downward toward the rear, and the upper concave groove 32b into which the upper half of the peripheral surface of the power cord 23 is fitted into the inclined surface portion. Is formed.
[0028]
Then, when the above-described presser plates 31 and 32 are overlapped in the front-rear direction, a cord plug that communicates with the notch 24 is provided between the upper concave groove 32b and the lower concave groove 31d or 31e that are arranged opposite to each other. A hole 34 is formed, and the notch passage portion 23b of the power cord 23 passes through the insertion hole 34 and is sandwiched between the upper and lower concave grooves 32b and 31d (31e) and fixed to the notch 24 (cover 11). The
One of the lower concave grooves 31d and 31e is selected in accordance with the thickness of the power cord 23. That is, if the power cord 23 has a large diameter, one lower concave groove 31d is selected and the small diameter is selected. If so, the other lower groove 31e is selected, and the front and rear presser plates 31 and 32 are overlapped so that the selected lower groove 31d or 31e faces the upper groove 32b. The small-diameter power cord 23 can be securely sandwiched between the upper and lower concave grooves 32b and 31d (31e).
[0029]
3 is a ground wire wired together with the power cord 23, and the ground wire 40 has a tip 41 fixed to the base 12 by a screw 42.
[0030]
In the spotlight of the present example configured as described above, the light bulb 4 moves back and forth along the optical axis L together with the base 12, the socket mounting plate 13, the socket 22, and the socket case 21 when the operation knob 14 is rotated. The position of the bulb 4 can be adjusted in the front-rear direction.
Further, if the eccentric cam shaft 18 is rotated by an operation of a driver or the like, the socket mounting plate 13, the socket 22, and the socket case 21 move up and down, and the vertical position of the bulb 4 can be adjusted (FIG. 4). To FIG. 6).
Therefore, the errors in the front-rear direction and the vertical direction between the light center position of the bulb 4 and the focal point of the reflector 5 can be individually corrected.
[0031]
Further, when the bulb holding springs 22a, 22a of the socket 22 are worn due to long-term use, first, the knurled screw 10 is loosened to remove the cover 11 from the rear opening 1a of the lamp house 1, and the front of the cover 11 The light bulb position adjusting means c, the socket part d, the light bulb 4 and the power cord 23 attached to the side are removed together (see FIG. 8).
Next, the screw 33 is loosened, the front and rear cord pressers 31 and 32 are removed from the cover 11, the power cord 23 is removed from the notch 24, the bulb 4 is removed from the socket, and the screw 42 is loosened to loosen the ground wire tip 41. Remove from the base 12 (see FIG. 9).
Further, the screw 50 is loosened to remove the socket case 21 and the socket 22 from the socket mounting plate 13, and the screw 26 is loosened to remove the cord clips 25a and 25b, the power cord 23, and the socket 22 from the socket case 21 (FIG. 10 to FIG. 10). 11), the socket 22 can be replaced without disassembling the bulb position adjusting means c.
[0032]
As mentioned above, although one example of the embodiment of the light bulb adjusting mechanism of the spotlight according to the present invention has been described with reference to the drawings, the present invention is not limited to this and is described in each claim of the claims. It goes without saying that various modifications are possible within the scope of the technical idea.
[0033]
【The invention's effect】
Since the spotlight bulb adjusting mechanism according to the present invention is configured as described above, the following effects can be obtained.
[0034]
(Claim 1)
By rotating the operation knob, the screw shaft is screwed forward and backward to align the bulb in the longitudinal direction, and by rotating the eccentric cam shaft, the eccentric cam shaft is eccentrically rotated to align the bulb in the vertical direction. Therefore, the adjustment of the position of the light bulb can be reliably performed with a simple operation without requiring skill.
[0035]
(Claim 2)
Without disassembling the bulb position adjustment means, the socket and power cord can be removed and replaced easily.
[0036]
(Claim 3)
By fixing the power cord at a predetermined position by the cord presser, it is possible to prevent the power cord from being inadvertently pulled out and cut.
[0037]
(Claim 4)
Since the cord retainer can handle two types of power cords, large diameter and small diameter, the number of parts can be reduced, and power cords of different thickness can be securely clamped to obtain the above-mentioned effect .
[Brief description of the drawings]
FIG. 1 is a simplified side view showing an example of an embodiment of a spotlight according to the present invention.
2 is an enlarged cross-sectional view showing the main part of FIG.
FIG. 3 is an exploded side view of a light bulb position adjusting means and a socket part.
FIG. 4 is an enlarged front view of a light bulb position adjusting means and a socket part.
5 is an operation diagram showing the upward movement position of the socket portion in FIG. 4; FIG.
6A is a vertical side view of FIG. 4, and FIG. 6B is a vertical side view of FIG.
FIG. 7 is a simplified diagram showing a procedure for attaching a cord presser.
FIG. 8 is a simplified diagram illustrating a procedure for removing a socket.
FIG. 9 is a simplified diagram illustrating a procedure for removing a socket.
FIG. 10 is a simplified diagram showing a procedure for removing a socket.
FIG. 11 is a simplified diagram showing a procedure for removing a socket.
[Explanation of symbols]
a: Lamp body 1: Lamp house 2: Cutter mechanism part 3: Lens tube 4: Light bulb 5: Reflector c: Light bulb position adjusting means 11: Cover 12: Base 12a: Screw shaft 13: Socket mounting plate 14: Operation knob 17: Long hole 18: Eccentric cam shaft d: Socket part 21: Socket case 22: Socket 23: Power cord 24: Notch 30: Cord presser 31: Front presser plates 31d, 31e: Lower concave groove 32: Rear Side presser plate 32b: upper groove

Claims (4)

A cutter mechanism that cuts the light projection into an arbitrary frame shape is disposed in front of a lamp house that incorporates a light bulb, a reflector, a bulb position adjusting means, and the like, and one or more lenses are disposed in front of the cutter mechanism. A light bulb adjustment mechanism in a spotlight in which a lens body is disposed to constitute a lamp body,
The light bulb position adjusting means includes a cover that is detachably attached to the rear opening of the lamp house, a base that is held back and forth on the front side of the cover, and a vertical movement that is movable up and down on the front side of the base. It consists of a socket mounting plate that is held at the front and the socket part is mounted on the front surface,
A screw shaft projecting on the rear surface of the base is screwed into an operation knob provided on the rear surface side of the cover so as to be rotatable, and the base moves back and forth along the optical axis by the rotation of the operation knob. In addition, the socket mounting plate is provided with a long hole for inserting an eccentric cam shaft that is rotatably held on a base, and the socket mounting plate is configured to move up and down by the rotation of the eccentric cam shaft. A light bulb adjustment mechanism for spotlights. The socket part includes a socket case that is detachably attached to the front surface of the socket mounting plate, and a socket that is covered with the socket case and fixed to the front surface of the socket mounting plate, and a power cord connected to the socket is provided. 2. The spotlight bulb adjusting mechanism according to claim 1, wherein wiring is made inside the lamp house through a notch provided in an outer peripheral edge of the cover. A cord presser for fixing the notch passage portion of the power cord to the cover; the cord presser having a front presser plate having a lower concave groove into which a lower half portion of the peripheral surface of the power cord is fitted; The upper half of the circumferential surface of the power cord is formed of a rear holding plate having an upper groove, and the upper and lower holding grooves are overlapped with the upper and lower groove to define the notch passage portion of the power cord. 3. The spotlight bulb adjusting mechanism according to claim 1, wherein the front and rear holding plates are detachably fixed to the rear surface of the cover while being sandwiched. Protrusions having the lower groove are provided on both front and rear sides of the front presser plate, and one lower groove is formed so that a large-diameter power cord can be inserted, and the other lower groove The groove is formed so that a small-diameter power cord can be inserted, and either the front or rear surface of the front presser plate can be selected as an overlapping surface with the rear presser plate according to the diameter dimension of the power cord. The light bulb adjustment mechanism for a spotlight according to claim 3.

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