JP4337651B2 - Spot lighting fixtures - Google Patents

Description

  The present invention relates to a spot lighting apparatus mainly used in a stage or a studio.

  As shown in FIG. 5, this type of spot illuminator generally includes a plano-convex lens or Fresnel lens 2 provided on the front surface of the main body 1, and a lamp 4 and a reflecting mirror 5 provided on a slide table 3. And a focus function is provided to arbitrarily change the size of the irradiated surface. For this focus function, a focus knob 6 operated by the user is provided, and by rotating the focus knob 6, the lamp 4 and the reflecting mirror 5 are moved together in the direction of arrow A, and the front lens is moved. By adjusting the distance in the optical axis direction (not shown), the size of the irradiation surface by the lamp 4 can be changed. There is a guide rod 3 provided with a spiral groove, and a projection projected from the slide base 3 is fitted into the spiral groove, and the slide base 3 can be slid by rotating the guide bar 3. (For example, refer to Patent Document 1).

  Further, as a mechanism for moving the slide base 3, there is a configuration using an operation lever 7 as shown in FIG. One end of the operation lever 7 serves as a fulcrum, and a projection 3b protruding from the slide base 3 is fitted into a long hole provided in the intermediate portion. The slide base 3 can be moved by moving the operation end of the operation lever 7.

  Here, the specific structure of the lighting fixture using the operation lever 7 shown in FIG. 6 is demonstrated with reference to FIG. 7, FIG. The main body housing 11 is provided with two parallel guide rods 8, 8 that pass through the slide base 3 and guide the slide base 3 to be movable. The slide table 3 is provided with a lamp socket 4 a and a reflecting mirror 5, and an operation lever 7 for moving the slide table 3. The operation lever 7 has a fulcrum 7 a on the main body housing 11 side, and a pin 3 b provided on the slide base 3 is fitted in a long hole 7 b opened in the operation lever 7 at an intermediate portion. An operation end of the operation lever 7 protrudes from a slit 12 provided in the main body housing 11. When the operation end of the operation lever 7 is moved, the slide base 3 slides along the guide bar 8.

In the configuration using the operation lever 7 as described above, the slide table 3 can be moved instantaneously, but depending on the posture of the luminaire, the lamp 4 and the reflecting mirror 5 can move without being held at the installation position. May end up. In order to prevent this, the operating lever 7 is sandwiched between two leaf springs 17 to give friction so that the slide base 3 is held at a set position.
JP 11-25713 A

  However, as described above, in the configuration using the operation lever 7, it is necessary to specially provide the leaf spring 17 for maintaining the set irradiation surface size, which increases the number of parts and assembly man-hours. Moreover, in the lighting fixture as shown in the above-mentioned Patent Document 1, when changing to an irradiation surface of a desired size, the slide base is moved by rotating the guide rod instead of operating the operation lever. For this reason, it took time to move the slide table, and it was not suitable for instantaneous operation.

  The present invention solves the above-mentioned problem, and provides a spot illuminator that improves the workability by reducing the number of parts and the number of assembling steps in a configuration in which the size of an irradiation surface is changed by moving an operation lever. For the purpose.

  In order to achieve the above object, the present invention includes a lens provided on a front surface of a main body, a light source and a reflector mounted on a slide base positioned behind the lens and movable in a lens optical axis direction, and the slide. In a spot illuminator comprising: a guide for movably guiding a table; and an operation lever for moving the slide table to adjust a distance in the optical axis direction of the light source with respect to the lens. The slide table is provided with a protrusion that engages with the spiral groove, the angle of the spiral groove is applied, a resistance load is applied to the movement of the slide table in the optical axis direction, and the slide is slid The table is set so that it can be held at the position set by operating the operation lever.

  According to the present invention, the slide base can be moved by moving the operation lever, and the size of the irradiation surface can be changed, thereby improving workability. At this time, since the protrusion of the slide base is engaged with the spiral groove of the guide, the slide base is set by applying a resistance load to the movement of the slide base in the optical axis direction. Will not accidentally move from the set position. For this reason, the structure which pinches | interposes an operation lever with the conventional leaf | plate spring becomes unnecessary, and can reduce a number of parts and an assembly man-hour.

  Hereinafter, a spot lighting apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG.1 and FIG.2 has shown the internal structure of the spot lighting fixture. The spot illuminator includes a slide base 3 that is movable in the direction of the lens optical axis of a lens (not shown) provided on the front surface of the main body housing 11, a socket 4a of a lamp (light source) mounted on the slide base 3, and a reflection. A mirror 5, two parallel guide rods 8 and 8 (guides) for movably guiding the slide base 3, and an operation lever for moving the slide base 3 to adjust the distance in the optical axis direction with respect to the lens of the lamp 7. The guide bar 8 passes through a through hole provided in the slide table 3, and both end portions are rotatably held by the main body housing 11. A pin 3b protruding from the slide base 3 is fitted into a long hole 7b opened in the intermediate portion of the operation lever 7, and the operation end of the operation lever 7 passes outside through the slit 12 of the main body housing 11. It protrudes.

  At least one guide rod 8 far from the fulcrum 7a of the operating lever 7 is cut with a spiral groove 8a, and the slide base 3 is provided with screw feet 9 (protrusions). The screw foot 9 is engaged with. The angle of the spiral groove 8a is set so that an appropriate resistance load can be applied to the movement of the slide table 3 in the optical axis direction. The appropriate resistance load is set to a level necessary to enable the slide table 3 to be held at the set position by operating the operation lever 7 even when the slide table 3 is subjected to its own weight (details will be described later). As shown in FIG. 2, the fitting position between the long hole 7b of the operating lever 7 and the pin 3b is more orthogonal to the moving direction of the slide table 3 than the engaging position between the groove 8a and the screw foot 9. In the direction, it is desirable for operation to be on the side close to the fulcrum 7a.

  In the above configuration, when the operation end of the operation lever 7 is moved, the slide table 3 is moved by fitting the elongated hole 7b and the pin 3b. At this time, since the screw foot 9 of the slide base 3 is engaged with the spiral groove 8a of the guide bar 8, the guide bar 8 is rotated while relatively moving in the spiral groove 8a.

  FIG. 3 shows the configuration of the engaging portion between the screw foot 9 of the slide base 3 and the guide bar 8. If the pitch p of the grooves 8a and 8a of the guide bar 8 is small, the resistance in the moving direction of the slide base 3 increases. Therefore, it is necessary to separately attach a member that gives friction to the operation lever and the guide bar as in the past. Disappears. Thereby, a member and an assembly man-hour can be reduced. On the contrary, when the pitch of the grooves 8a and 8a cut by the guide rod 8 is large, the resistance in the moving direction of the slide table 3 is small. In this case, when the irradiation with the lamp is in the direction parallel to the gravity, the size of the irradiation surface set by the operation of the operation lever 7 is maintained by the weight of the slide base 3 and the socket 4a mounted on the slide base 3. Difficult to do.

  4A and 4B show a case where the pitch p of the groove 8a of the guide bar 8 in the direction of arrow A of the slide table 3 is large and a case where it is small. Here, the case where the irradiation direction by the lamp is parallel to gravity is shown, d is the width of the groove 8a, W is the weight of the slide base 3, and F1 and F2 are the forces acting on the screw foot 9 due to the weight. . As shown in FIG. 6A, when the pitch p of the groove 8a cut in the guide rod 8 is large, the force F1 that the screw foot 9 tends to travel along the groove 8a increases, and thus the resistance is small. On the other hand, as shown in FIG. 5B, when the pitch p of the groove 8a cut in the guide rod 8 is small, the force F2 that the screw foot 9 tries to travel along the groove 8a becomes small and the resistance increases. Become. For this reason, a larger force is required when the operation lever 7 is operated. Therefore, the pitch p is not necessarily reduced as much as possible, and an appropriate value is determined depending on the weight of the slide table 3 mounted components such as the slide table 3 and the reflecting mirror 5. Further, by increasing the length of the operation lever 7, it is possible to improve the lever operability. The length of the operation lever 7 can be changed by a method of expanding and contracting, or can be changed by a removable method.

  The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the guide bar 8 may be only the one provided with at least the groove 8a. Further, instead of holding the guide bar 8 provided with the groove 8 a in the main body housing 11 in a rotatable manner, the screw foot 9 is formed in a nut shape screwed into the groove 8 a of the guide bar 8, and is attached to the slide table 3. The guide rod 8 may be rotatably mounted around the axis of the guide rod 8, and the guide rod 8 may be fixed to the main body housing 11.

The perspective view which shows the internal structure of the spot lighting fixture which concerns on one Embodiment of this invention. The top view which shows the internal structure of the lighting fixture. The front view which shows the engaging part structure of the screw leg of a slide stand, and a guide bar. (A) (b) is a figure which shows the case where the pitch of the groove | channel of the guide rod of a slide stand is large, and a small case. The cross-sectional view of the conventional spot lighting fixture. The longitudinal cross-sectional view of the conventional spot lighting fixture. The perspective view of the spot lighting fixture of FIG. The top view of the spot lighting fixture of FIG.

Explanation of symbols

3 Slide base 4a Lamp (light source) socket 5 Reflector 7 Operation lever 8 Guide bar (guide)
8a Spiral groove 9 Screw foot (protrusion)
11 Body housing

Claims (1)

A lens provided on the front surface of the main body, a light source and a reflector mounted on a slide base positioned behind the lens and movable in the lens optical axis direction, a guide for guiding the slide base movably, In a spot illuminator comprising: an operating lever that moves the slide base to adjust the distance of the light source in the optical axis direction with respect to the lens;
The guide is provided with a spiral groove,
The slide table is provided with a protrusion that engages with the spiral groove,
The spot illuminator characterized in that the angle of the spiral groove is set so that a resistance load is applied to the movement of the slide base in the optical axis direction and the slide base can be held at a position set by operating an operation lever. .

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