JPS6127041Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a projector, and its purpose is to make focus adjustment extremely easy.

Fig. 1 shows a conventional example, in which a threaded rod 2 supported at both ends and rotatable from the back is provided in the main body 1, and a socket base 3 is attached to the threaded rod 2, which moves forward and backward by the rotation of the threaded rod. A lamp 4 is held in a socket base 3 by screwing, and the amount of projection of the lamp 4 from the central hole of a reflecting mirror 5 provided in the main body 1 is variable. By rotating the threaded rod 2, the socket base 3 is moved forward and backward, and the positions of the lamp 4 and the reflecting mirror 5 are changed to adjust the focus according to the irradiation position.

However, in such a projector, in order to rapidly change the irradiation position and adjust the focus, the threaded rod 2 must be rotated extremely quickly, making it inconvenient to handle.

The present invention has been made in view of the above points, and will be explained below based on the drawings.

Figures 2 to 4 show an embodiment of the present invention, in which a convex lens 7 is attached to the front opening of the main body 1, which is a bottomed cylindrical body, and a convex lens 7 is installed inside the main body 1 at a certain distance from the lower surface of the main body 1 than the legs. A rail 6 parallel to the axial direction of the main body is attached, and a socket base 3 and a reflection mounting base 9 are provided with a recess 8 in the center that straddles the rail 6. The socket base 3 and the reflector mounting base 9 are integrally attached to the rail 6 so as to be slidable. Lamp 4 on socket base 3
A reflector 5 located behind the lamp 4 is attached to the reflector mount 9. Further, the tip of an operating rod 11, which is a square bar, is rotatably caulked and attached to the reflector mounting base 9, and the operating rod 11 penetrates the bottom surface of the main body 1 outward, and a knob 12 is provided at the tip. ing. An operating rod 11 is provided between the rear end of the rail 6 and the back of the main body 1.
A gripping spring 13 in the shape of an abbreviated character, with the inside thereof inserted, is attached to the lower surface of the main body 1 at both ends thereof, and this gripping spring 13 has a parallel portion 14 whose inner width is slightly wider than the dimension between the parallel surfaces of the operating rod 11. However, a convex portion 16 that is convex inward is formed in a bent portion 15 that bridges the upper end.

However, grasp the knob 12 at the tip of the operating rod 11,
By pushing and pulling the operating rod 11 back and forth, the socket base 3 and reflector mounting base 9 slide back and forth along the rail 6, and the relative position of the lamp 4 with respect to the convex lens 7 changes to reach the desired irradiation position. Allows for precise focus adjustment. After the focus adjustment is completed, press the operation rod 11.
By rotating approximately 1/8 rotation about its axis,
The operating rod 11 has a diagonal direction, which is the long axis of its cross section, facing the clamping spring 13, and the clamping spring 13, while bent outward by its elastic force, clamps the operating rod 11 in the diagonal direction and moves back and forth by frictional force. prevent the movement of At this time, the other corner of the operating rod 11 comes into contact with the convex portion 16 of the clamping spring 13 to prevent the operating rod 11 from over-rotating due to the clamping force of the clamping spring 13, thereby maintaining the clamped state.

The same applies to the structure in which the lamp 4 is made to appear and disappear from the reflecting mirror 5 as shown in FIG.

As described above, the present invention rotatably locks the operating rod 11 inserted through the bottom surface of the main body 1 into a socket base that slides back and forth, and the operating rod 11 has a polygonal cross section and is larger than the short diameter of the cross section. Since the clamping springs 13 whose width is smaller than the major axis are inserted so as to be able to move back and forth, and can be clamped in the major axis direction in a rotating state, focusing can be quickly adjusted by simply pushing and pulling the operating rod 11 back and forth. After that, the focus can be fixed by rotating the operating rod 11 so that its longer diameter direction is clamped between the clamping springs 13.

[Brief explanation of the drawing]

FIG. 1 is a sectional front view showing a conventional example. Second
4 to 4 show an embodiment of the present invention, FIG. 2 is a schematic sectional front view, FIG. 3 is an exploded perspective view of the main part, and FIG. 4 is a sectional side view showing the operating state of the clamping spring. 5 is a sectional front view showing another embodiment of the present invention. 1...Main body, 2...Threaded rod, 3...Socket base, 4...Lamp, 5...Reflector, 6...Rail, 7...Convex lens, 8...Concave portion, 9...Reflector mounting base , 10... socket, 11... operating rod, 1
2... Knob, 13... Clamping spring, 14... Parallel part, 15... Bent part, 16... Convex part.

Claims (1)

[Claims for Utility Model Registration] (1) The tip of an operating rod inserted through the bottom of the main body is rotatably locked in a socket base that moves back and forth, and the operating rod has a polygonal cross section. At the same time, the operating rod is inserted between parallel clamping springs having a width larger than the minor axis of the cross section and a width smaller than the major axis so as to be freely movable back and forth, so that the operating rod can be clamped in the major diameter direction between the clamping springs in a rotating state. A floodlight characterized by: (2) The projector according to claim 1, wherein the clamping spring has a convex portion on which a corner of the operating rod in a rotating state comes into contact at a portion bridging the upper portion of the parallel portion.