JPH0754890Y2 - Photographic dark room lighting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION I) Industrial field of application The present invention relates to an illuminating lamp for a photographic dark room, in which a safelight filter portion of the illuminating lamp is formed into a semi-cylindrical shape having a wide-angle peripheral surface. , So that the entire dark room can be illuminated brightly, and the shading plate is attached to the filter so that the shading plate can be moved and adjusted along the peripheral surface of the filter to prevent erroneous exposure to light due to direct light rays on the film. It is intended to provide lighting for photographic darkrooms that are illuminated all around the room.

II) ... Prior art and its problems As a recent tendency in photographic development work (especially development work of X-ray film in hospitals), various recent equipments have been introduced into a dark room to accelerate work, and However, in order to improve the efficiency of the work, to easily operate various equipment, and to give the operator a feeling of liberation and reduce mental and physical fatigue, it is necessary to make the entire dark room as bright as possible. It has been earnestly desired that an illuminating lamp (safelight illuminating lamp) capable of brightly illuminating the dark room, particularly the entire dark room, is further desired.

[Conventional Example 1] However, the conventional illumination lamps are mainly those of direct illumination type in which a flat safelight filter glass 12 is attached to the bottom surface of a light-shielding lamp house 11 as shown in FIG. Yes, as shown in FIG. 7 (c), this is, of course, "local lighting" that illuminates only the E ray region, which is a limited range directly under the lighting, that is, the film and the worker. It illuminates the E ray area near the hand with a brightness equivalent to the safety light, and the D area around it becomes slightly dark, which is inconvenient to operate the above equipment, and the ceiling direction is completely dark. Therefore, there is a drawback that the operator is given psychological pressure and fatigue of not only the eyes but also the mind and body becomes extremely large especially when working for a long time.

[Prior art example 2] Also, there is one such as the utility model No. 50-38987, the name of the invention "dark room illumination lamp", which is as shown in FIG. A light-transmitting cylindrical disc 17 is rotatably fitted around the light-shielding circular disc 16 for the three colors of red, yellow, and green. The surface is completely shielded from light, and light is emitted only from the cutout portion 16 ', and the color-transparent cylinder 17 is rotated with respect to the cutout portion 16' for normal (yellow) and development work ( Green) and printing paper printing operation (red). The dark room illumination is "local illumination" as in the prior art example 1, and only the E ray region of the film work surface is equivalent to the safety ray portion. It retains brightness, but all other peripheral areas D are dark.

III) The purpose of the present invention The present invention has been made in view of the above circumstances. Since the conventional illuminating lamp uses only the E ray region of the lower surface of the lamp as the light emitting surface, the light emitting range of the light beam is naturally limited. Since it becomes narrow and can illuminate only a limited area (local illumination), and since the light rays that have passed through the filter are directed to the film, the distance from the film is increased to avoid erroneous exposure. It was necessary to increase the light-shielding properties of the filter, or to use a dark lamp, which led to a vicious cycle of darkening the dark room more and more. Is formed into a semi-cylindrical shape having a wide-angle (approximately 180 °) light-emission circumferential surface so that the dark room can be illuminated with safe light as a whole, and particularly, in the light-emission circumferential surface of the filter. By installing a light-shielding plate whose movement is adjustable, as shown in FIG. 7A, the A and B ray regions (the rays in this range have a distance to the processing surface such as the film, so when they reach It becomes a safe light ray by attenuating) and a C light ray area (safe light ray area) is formed, and by forming the C light ray area, it is possible to prevent an erroneous exposure due to a direct light ray on the film surface. In addition to being much brighter than before, it is possible to illuminate the entire dark room in particular, and the safety of the film can be maintained more than before due to the action of the shading plate, etc. This is a developed dark room lighting.

IV) ... Means for Solving the Problem That is, according to the present invention, a peripheral surface plate 5 and a semicircular plate having a wide-angle (approximately 180 °) peripheral surface are provided on the lower surface of a body plate 4 having an appropriate light source on the lower surface. A safe light filter 7 such as a semi-cylindrical shape composed of left and right side plates 6 of a shape or the like is appropriately mounted, and a light shielding plate 8 is provided.
Is attached to the tip of an arm 10 which is attached to the left and right side plates 6, 6 so as to be able to rotate in an arc with a pivot 9, and the arm 10 is rotated in an arc, or a magnet 15 is attached to the upper and left side edges of the light shielding plate 8. While being fixed, the strip 14 is attached to the left and right side edges of the outer peripheral surface of the safelight filter 7, and the magnet of the shield plate 8 is attracted to and removed from the strip 14 to remove the rectangular shield plate 8 from the safelight filter. The problem is solved by the photographic darkroom illumination lamp installed so that the movement can be adjusted along the inner peripheral surface or the outer peripheral surface of 7.

V) Embodiment (1) Next, the embodiment of the present invention will be described with reference to the drawings. An appropriate light source such as a light bulb or a fluorescent lamp may be provided on the lower surface,
Attach the light bulb 1, its socket 2, switch 3 etc. appropriately,
A projection peripheral plate having a wide-angle (approx. 180 °) projection peripheral surface on the bottom surface of a main body plate 4 of a substantially rectangular flat plate whose upper surface is directly attached to the ceiling or wall of a dark room or suspended from the ceiling. 5 and semi-circular left and right side plates 6 and 6 are attached to a safe light filter 7 such as a semi-cylindrical semi-cylindrical shape, and the tip of an arm 10 is attached to the left and right side plates 6 and 6 with a pivot shaft 9 in a freely arcable manner. By attaching a light shielding plate 8 of a rectangle or the like to the arm 10 and rotating the arm 10 in an arc, or by attaching a metal band 14 made of stainless steel plate or the like to the left and right side edges of the outer peripheral surface of the safelight filter 7, The magnets 15 are fixed to the left and right side edges of the upper surface of 8 and the magnets 15 of the light shielding plate 8 are adsorbed to and removed from the band 14 to move the light shielding plate 8 along the inner peripheral surface or the outer peripheral surface of the light emitting peripheral surface plate 5. Adjustable and properly installed .

(2) The safelight filter 7 can be formed by processing a glass plate as in the conventional case, but the cost is high. Therefore, in the embodiment of the present invention, the newly developed colored translucent filter effect is used. Bending a plastic plate having, to form one or a plurality of plates to form the main body of the filter, and further, if necessary, by laminating a purple, red or half-mirror plastic film on the inside and outside thereof, Although it is configured to emit the safety light, it is not limited to such a configuration, and any configuration can be used as long as the safety light can be emitted.

(3) The external shape of the safelight filter is, in addition to the semi-cylindrical shape as shown in the first to fifth illustrations, a polygonal rectangular tube shape such as a triangular tube shape, a trapezoidal shape or a square shape, that is, a wide angle (180 °) Any shape may be used as long as it has a peripheral surface.

(4) ... Further, the movement adjusting means of the light shielding plate 8 with respect to the peripheral surface of the safelight filter 7 is as in the first to fourth illustrated examples.
By rotating the arm 10 in an arc by the pivot 9, the arm 10 is movably provided along the inner peripheral surface of the light emitting peripheral surface plate 5, or, as in the fifth illustrated example, the magnet 15 of the light shielding plate 8 with respect to the band 14 is provided. It is provided so as to be movable along the outer peripheral surface of the projection peripheral plate 5 by adsorption and desorption.

(5) ... The light-shielding plate 8 can be provided so as to have a certain degree of light-shielding property in the same manner as the filter, in addition to the light-shielding plate having the total light-shielding property. It is desirable to use a plastic plate or the like.

(6) Further, if necessary, for example, as shown in FIG.
It is also possible to separately install two rectangular light-shielding plates each having a set width so as to be rotatable, and to adjust the light-shielding width and the like by adjusting the degree of polymerization with each other.

(7) Then, the lighting device of the present invention is installed by directly attaching the upper surface of the main body plate 4 to the ceiling of a dark room or by suspending it from the ceiling. At that time, the light beam of the light source 1 can be emitted from the entire wide-angle (approximately 180 °) projection peripheral plate 5 of the safelight filter 7 having a semi-cylindrical shape to brightly illuminate the entire dark room. The photosensitivity of the film varies with the amount of light rays, which is inversely proportional to the square of the distance. Therefore, when the distance cannot be sufficiently secured, it is necessary to control (shield) the direct light particularly to the film. The safelight filter of the present invention is configured to emit safe light, but it maximizes the brightness as an illumination lamp to keep the entire dark room as bright as possible, and to prevent adverse effects on the film. Has
It is to block the direct rays of light to the film. Therefore, the present invention freely adjusts and moves the light shielding plate 8 along the inner peripheral surface or the outer peripheral surface of the light emitting peripheral surface plate 5 to a required light shielding position with respect to the film 13 so that the A, B light ray regions and the C light ray regions are placed in a dark room. Is formed so that only the target portion (C ray region = safe ray region) can be effectively shielded from direct rays.

VI) ... Effect As described above, the dark room illumination lamp of the present invention can be constructed to be significantly brighter than the conventional one, and the entire dark room can be illuminated brightly with the safety light emitted from the wide-angle (approximately 180 °) emissive peripheral surface. Since the lighting is all around the room, the work efficiency of the worker is improved and the operation of various devices is easy to perform. Especially, since the room is bright as a whole, the operator can feel a sense of openness and reduce physical and mental fatigue. There is an excellent feature that it is effective, and that a position-adjustable light-shielding plate is provided for the film so that there is no risk of false exposure.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of an embodiment of the dark room illumination lamp of the present invention, FIG. 2 is a side view thereof, FIGS. 3 and 4 are explanatory views of the action of a shading plate, and FIG. 5 is a shading plate. FIG. 6 shows another embodiment of the movement adjusting structure of FIG. 6, (a) is a front view and a side view of the dark room illumination lamp of the present invention, (b) is a plan view and a side view of the light shielding plate, and FIG. FIG. 7 is a front view and a side view showing a schematic configuration of an illumination lamp for a vehicle, and FIG. 7 is an operation explanatory view of the present invention and conventional examples 1 and 2.
(A) is the present invention, (B) is a conventional example 2, and (C) is a conventional example 1.
FIG. Appendices 1 ... Light source, 2 ... Socket, 3 ... Switch, 4 ... Body plate,
5 ... Emissive peripheral plate, 6 ... Left and right side plates, 7 ... Safelight filter, 8 ... Shading plate, 9 ... Axis, 10 ... Arm, 13 ...
Film, 14 ... Belt, 15 ... Magnet, 11 ... Lamp house of Conventional Example 1, 12 ... Safelight filter glass of Conventional Example 1, 16 ... Light-shielding disk of Conventional Example 2, 16 '... Its cutout portion, 17 ... The color-transmitting light-transmitting cylinder of Conventional Example 2.

Claims (1)

[Scope of utility model registration request] 1. A semi-cylindrical shape or the like consisting of a main surface plate 4 having an appropriate light source on the bottom surface thereof, and a bottom surface plate 5 having a projection peripheral surface of approximately 180 ° and left and right side plates 6 such as semi-discs. The safelight filter 7 is appropriately attached, and the light shielding plate 8 is attached to the tip of an arm 10 which is attached to the left and right side plates 6 and 6 with a pivot 9 so as to be freely rotatable in an arc.
By rotating the arc, or while fixing the magnets 15 to the left and right side edges of the upper surface of the light shielding plate 8, the belt 14 is attached to the left and right side edges on the outer peripheral surface of the safelight filter 7. An illumination lamp for a photographic dark room in which a rectangular shading plate 8 is installed so as to be movable along the inner peripheral surface or the outer peripheral surface of a safelight filter 7 by adsorbing and removing a magnet 15 from the shading plate 8.