JPH019950Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention A. Industrial application field The invention of the present application solves the problem of heat from high-intensity lamps, which is a problem when enlarging machines are made to be extremely large (film usage area is 20 inches x 20 inches or more). This aims to reduce the amount of waste and make it easier to handle the film.

B. Conventional technology and problems Currently, the maximum film area used by enlargers is 10 inches.
Up to 20 inches, and if the area used for the film was larger than this (20 inches x 20 inches or more), problems such as insufficient light intensity and the weight of the negative carrier used to set the film remained unsolved. When the amount of light is increased, heat reaches the film, which may cause it to burn. The maximum light output of a normal enlarger is a halogen lamp of up to 2kw. If the lamp is longer than this, the film will burn.

B. Structure of the invention A. Means for solving the problem This application attempts to solve the problem by the following means. That is, in the enlarger body 1', a film insertion part 4 is formed on the front surface of the lamp house 2 via a diffusion box 3, and a bellows 5 is removably disposed on the front surface of the film insertion part 4. A cold mirror 2B is installed at the rear and an infrared cut filter 2C is installed at the front around a 5kw to 8kw halogen lamp 2A installed inside, and a heat exhaust pipe 2E is installed on the ceiling 2D of the lamp house 2.
On the other hand, the diffusion glass 3 in the diffusion box 3
A presser glass 6 is provided on the front surface of the diffusion box 3 so as to be openable and closable.

B. Example 1 is an ultra-large enlarger according to the present invention. In the enlarger body 1', a film insertion section 4 is formed on the front surface of the lamp house 2 via a diffusion box 3, and a bellows 5 is removably disposed on the front surface of the film insertion section 4. 5kw~ installed in
A cold mirror 2B is provided at the rear of the 8kw halogen lamp 2A, and an infrared cut filter 2C is installed diagonally in the front. This allows light to travel in a straight line and heat to be reflected upwards. Furthermore, the ceiling 2D of the above lamp house 2
A heat exhaust cylinder 2E is provided. On the other hand, a presser glass 6 is provided on the front surface of the diffusion glass 3A in the diffusion box 3 so as to be openable and closable with respect to the diffusion box 3. 6A is a hinge connecting the lower end of the glass 6 and the lower end of the box 3;
is a link that connects the glass 6 and the box 3, and prevents the glass from opening beyond a certain level. Reference numerals 6C and 3C designate engaging/disengaging metal fittings provided between the glass 6 and the box 3, and 5A, 3B designating engaging/disengaging fittings provided between the bellows 5 and the box 3. 7 is a filter insertion part.

C Effect of the idea It will be explained along with its action.

The method to cut the heat from 5kW or higher halogen lamps is to use a regular cold mirror and heat-insulating glass, but also to cut the heat with an infrared cut filter. This infrared cut filter works to cut only infrared rays that are unrelated to the amount of light.

Furthermore, in order to set the film, the bellows is first contracted and removed from the film insertion portion 4, which is made of milky white glass. Attach a large film to the diffuser plate using Sellotape (trademark). Next, use the presser glass 6 to make a sandwich with one touch, press down on the sag of the film, and set it. The set of the film is completed by extending the contracted bellows and connecting it to the film insertion section.

As described above, according to the present invention, by employing an infrared cut filter, it is possible to use a lamp with a strong light intensity, and it is possible to increase the size of the enlarger. Naturally, as enlargers become larger, larger films must be used, but larger ones (20 inches.
x 20in.) is difficult to set up with a normal negative carrier because the weight of the metal and glass alone is considerable, but the bellows can be easily removed and the large film can be attached directly to the diffuser plate. The operation problem can be greatly solved because the setting can be completed by touching the glass with a single touch.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the whole, and FIG. 2 is an enlarged view of the main parts with a part of the same as the above cut away. 2... Lamp house, 2A... Halogen lamp, 2B... Cold mirror, 2C... External line cut filter, 2E... Heat exhaust tube, 3... Diffusion box, 4... Film insertion part, 5... Bellows, 6...
...Pressure glass.

Claims (1)

[Scope of utility model registration request] In the enlarger body 1', a film insertion part 4 is formed on the front surface of the lamp house 2 via a diffusion box 3, and a bellows 5 is removably disposed on the front surface of the film insertion part 4. A cold mirror 2B is installed at the rear around a 5Kw to 8Kw halogen lamp 2A installed in the
An infrared cut filter 2C is installed diagonally on the front.
A heat exhaust pipe 2E is provided on the ceiling 2D of the lamp house 2, and a presser glass 6 is provided in front of the diffusion glass 3A in the diffusion box 3 so as to be openable and closable with respect to the diffusion box 3. A super large enlarger featuring