JPS61103135A - Cooling device of overhead type projector - Google Patents

Abstract

PURPOSE:To maintain a slide film and/or a slide file sheet at low temperatures by blowing air out of the 1st air outlet to the reverse surface of the slide film through the air intake of the slide file sheet. CONSTITUTION:When a blow-out fan 14 is driven, air passes through a connecting tube 13 and is blown out of the 1st air outlet 15 slantingly upward. Part of the blown-out air enter the space formed between the slide film 20 and a bottom wall 22 through the air intake 24 to cool the reverse surface of the slide film and the top surface of the bottom wall of the slide file sheet, and is blown out downward through an air outlet 25. The remainder of the air blown out of the air outlet 15 is sucked into a lamp house 2 through a suction port 16 while cooling the 2nd condenser lens held by a cylindrical supporting member 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cold 7J device for an overhead type magic lantern.

In so-called horizontal magic lanterns, in which condenser lenses, light source lamps, etc. are arranged horizontally apart, a blower fan is connected within the plane containing the lens system to create horizontal ventilation. It is common to cool both at the same time.

However, the second condenser lens and 7′
In overhead type magic lanterns, in which the slide film is placed outside the light-transmitting diffuser plate covered on the top surface of the machine frame, even if the cooling hoe mechanism of horizontal magic lanterns is applied as is, the second condenser lens, slide film, etc. If it is not possible to cool the lamp sufficiently and a halogen lamp is used as the light source lamp, it is necessary to cool the light source lamp to the same level as a slide film to bring it below the desired temperature. There are problems such as the cycle becoming inactive.

In order to solve this problem, the applicant has decided to
In No. 67883, a suction fan is connected to one side of the lamp house, a supporting member is attached to the upper end of the lamp house to hold the lamp at the upper end of the lamp house, and a translucent fan is attached to the upper end of the lamp house to close the upper part of the machine frame. The upper end edge of the support member is made to protrude upward from the diffuser plate, and this upper end edge is located near the slide film, and the suction port provided between the support member and the condenser lens is communicated with the suction fan via the lamp house. A cooling device for an overhead type magic lantern is disclosed.

Furthermore, the applicant has developed a slide file sheet for organizing and storing and projecting a plurality of translucent objects such as slide films and preparations by removably arranging them in the same plane in Japanese Patent No. 1055825. It was disclosed in the issue. This slide file sheet holds a film mount on which a slide film is attached at a distance parallel to the bottom wall of the sheet, and allows air to flow through the space formed by the film mount and the back wall of the sheet through an air inlet and an air outlet. It is designed to allow air to flow and prevent the slide film from being damaged by heating.

However, when using the above-mentioned slide film, it is difficult to maintain the slide film at a temperature below about 60°C even with the cooling device mentioned above, and projecting the same film for a long period of time may cause the color of the color slide to fade and the slide film to deteriorate. It had the disadvantage that it caused the problem of curvature, which was undesirable.

SUMMARY OF THE INVENTION An object of the present invention is to overcome the above-mentioned drawbacks and to provide an apparatus capable of maintaining a slide film and/or slide file sheet at a lower temperature than conventional apparatuses.

In order to achieve this purpose, the over-rad type magic lantern of the present invention is provided with a first air outlet communicating with a blowing fan on the side of a cylindrical support member, and slides onto the lower surface of a slide film attached to a slide file sheet. The present invention is characterized in that the air flowing out from the first air outlet is blown through the air inlet of the file sheet.

Furthermore, the feature of the pond is that a second air outlet connected to the blow-out fan is arranged above the slide file sheet, and the upper surface of the slide film attached to the slide file sheet is
The structure is such that air is blown through the second air outlet.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a preferred embodiment of an overhead type magic lantern equipped with the cooling device of the present invention. A cylindrical lamp house 2 with excellent heat conductivity is fixed to a base 1 of an overhead type magic lantern. Inside this lamp house 2, there are reflecting mirrors 8 that bend the luminous flux upward, and are arranged horizontally at an angle of 1°i.
A first filter 4, a first condenser lens 5, a light source lamp 6, and a light source mirror 7 are housed in the respective mounting members spaced apart from each other and held by supports 3. Furthermore, a suction fan 10 is connected to one side of the lamp house 2 via a suction vibrator 9, and a cylindrical support member 1 having a rectangular shape shown in FIG.
Attach 1. Then, the peripheral part of the circular second condenser lens 12 is held by this support member 11.
Keep lens 12 horizontal. Note that the support member 11 is
It has a first air outlet 15 connected to a blowing fan 14 via a connecting tube 13 and formed integrally with the support member 11, and a suction port 16 connected to a suction fan via the lamp house 2.

The upper end of this cylindrical support member 11 is made to protrude above the horizontal light-transmitting diffuser plate 17 covered on the upper surface of the machine frame of the magic lantern, and this upper end is connected to a moving stage ( The light-transmitting diffuser plate 17 is placed in the vicinity of the slide file sheet 18 attached to the lamp house 2 (not shown).
The light from 9 makes it easy to inspect and search the slide film 20 mounted on the slide file sheet 18.

The slide file sheet is shown in Figure 3. The slide file sheet 18 is formed of a transparent or translucent material, and each spacer in the shape of a rectangular restraint or rectangular recess that supports a slide film or a slide film mount, respectively, has protruding U IA spaced apart parallel to each other. al
l 2 'I, a bottom wall 22 and a side wall 23 defining the compartment.
, an air inlet 24 and an air outlet 25 formed in the bottom wall 22 or the side wall 23. Although the figure shows a slide file sheet having one air inlet 24 and one air outlet 25, the number of air inlets and air outlets may be increased or decreased as necessary.

Next, the operation of the cooling device of the present invention will be explained. When the blowing fan 14 is driven, air flows through the connecting channel i- as shown in FIG.
The air passes through the air outlet 13 and is blown out diagonally upward from the first air outlet 15. A part of the blown air passes through the air inlet 24 and slides into the film 2.
0 and the bottom wall 22, cools the bottom surface of the slide film and the bottom wall soil surface of the slide file sheet, and blows out downward through the air outlet 25. On the other hand, the remainder of the air blown out from the air outlet 15 is sucked into the lamp house 2 through the suction port 16 while cooling the second condenser lens held by the cylindrical support member 11. The remainder of the blown air simultaneously hits the lower surface of the bottom wall 22 of the slide file sheet 18 and the sheet 18
At the same time, it cools the slide film 20 and joins with the air blown out from the air outlet 25, further cools the second condenser lens, and is sucked into the lamp house 2 through the suction port 16. Therefore, the slide film 20
, the second condenser lens 12, and the inside of the cylindrical support member are also uniformly cooled. At this time, the suction fan 10 is also activated at the same time! It goes without saying that IJ1° is a good thing.

Inside the lamp house 2, the temperature of the air gradually rises while cooling the walls of the lamp house 2, the reflector 8, the filter 4, the first condenser lens 5, etc., and finally the light source lamp 6 and the light source. It cools down the mirror 7 and is sucked into the suction pipe 9. At this time, the temperature of the air at the lamp position has risen to a certain extent, so there is no risk that the lamp will become too cold and the halogen regeneration cycle will become inactive.

Another preferred embodiment is shown in FIG. In this embodiment, the connecting tube 13 shown in FIG. 4 and another connecting tube 13
This device blows air diagonally downward directly onto the slide film 20 from a second air blow-off port 26 disposed above the slide file sheet. Therefore, in this embodiment, the slide film 20 is cooled from above and below and from both sides, so that it can be cooled more effectively.

In the embodiment shown in FIG. 1, the first air outlet 1
5 is integrally molded with the cylindrical support member 11, but the air outlet 15 and the cylindrical support member 11 may be provided separately.

In yet another embodiment, in order to reduce the outside diameter of the machine frame of the magic lantern and to reduce the weight of the magic lantern, the suction fan 10 and the air blower 14 are driven by a single electric motor. You can also do it.

That is, the suction fan 10 and the blowout fan 14 are fixed directly to the drive shaft that intersects and penetrates the suction airflow passage and the blowout airflow passage via the passageway wall.

Note that the present invention is not limited only to this example,
For example, the support member may have a polygonal or cylindrical shape other than the rectangular shape, and the air outlet may be a long and narrow opening.
Alternatively, a plurality of them may be provided.

Further, the light source system may be of a horizontal type or a vertical type.

The cooling device of the present invention having the configuration described above has the following advantages compared to conventional devices:
Since the slide film is held at a temperature as low as about 10° C., the color of the color slide film does not easily fade, and since the slide film does not bend, clear images can be obtained. Note that if a halogen lamp is used as the light source lamp, the lamp generates less heat than a so-called incandescent lamp, so the upper limit of the temperature of the slide film can be kept even lower. Furthermore, by fixing the suction fan and the blowout fan to the same drive shaft, a desired cooling effect can be achieved without increasing the outer diameter of the magic lantern.

On the other hand, since the slide file sheet is also cooled at the same time, low-quality, low-cost materials can be used for sheet material binding.

Furthermore, the present invention is applicable not only to films mounted on a film mount, but also to a type in which a slide film is directly mounted on a file sheet. Although it can also be used for so-called bottomless slide file sheets, it is particularly effective for slide file sheets in which a space is formed between the slide film and the slide file sheet.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view schematically showing a preferred embodiment of the present invention, Fig. 2 is a perspective view showing a preferred example of a support member used in the present invention, and Fig. 3 is a partial sectional view schematically showing a preferred embodiment of the present invention. FIG. 4 is an explanatory diagram schematically showing the flow of cooling air when the present invention is used, and FIG. 5 is a perspective view of a slide file sheet using another preferred embodiment of the present invention. FIG. 1...Base 2...Lamp house 3...
・Strut 4... Filter 5... 1st
Condenser lens 6...Light source lamp 1...Light source mirror 8...
Reflector 9 Suction pipe 10 Suction fan 11 Cylindrical support member 12 Second
Condenser lens 13...Connection tube 14...Blowout fan 1
5... First air suction port 16... Suction opening 17... Transparent diffuser plate 18
... Slide file sheet 19 ... Lighting hole 20 ... Slide film 21 ... Seating section 22 ... Bottom wall 23 ...
- Side wall 24...Air inlet 25...Air outlet 26...Air outlet. Engraving of the drawings (no change in content) Figure 1 Figure 2 Procedural amendment (method) March 8, 1985 1, Indication of the case 1988 Patent Application No. 22, Ci 200-σZ Name of the invention Overhead type Relation between magic lantern cold nozzle device 3 and the amended case Patent applicant Slidex Co., Ltd.

Claims (1)

[Claims] 1. A lamp house including light source lamps located apart from each other and a first condenser lens, whose lower end is fixed to the base and whose upper end is open, and a light transmitting lamp house covered on the top surface of the machine frame. a diffuser plate, a cylindrical support member that is fixed to the upper end of the lamp house and holds the peripheral part of the second condenser lens and that protrudes above the light-transmitting diffuser plate; A slide file sheet is provided that is spaced parallel to the diffuser plate and that removably holds a slide film within a plurality of rectangular restraints, and the slide file sheet protrudes upward from the bottom wall of the rectangular restraint and seats the slide film. In an overhead type magic lantern, the overhead type magic lantern has at least one pair of spaced apart slide film seating parts, and an air inlet and an air outlet provided in the bottom wall of the rectangular restriction or the side wall of the rectangular restriction between the seating parts. , at least a portion of the air flowing out from the at least one first air outlet communicating with the blowing fan flows into the space formed by the rectangular bottom wall and the slide film through the air inlet. 2. A cooling device for an overhead type magic lantern, characterized in that said first air outlet is disposed corresponding to said air inlet of a slide file sheet. 2. Claim 1, wherein at least one second air outlet communicating with a blowing fan is disposed above the slide file sheet, facing the slide film.
A cooling system for the overhead type magic lantern described in 2. 3. A cooling device for an overhead type magic lantern according to any one of claims 1 and 2, in which the cylindrical support member and the first air outlet are integrated. 4. A suction fan that communicates with one side of the lamp house and cools the inside of the lamp house by air sucked through a suction hole provided in the cylindrical support member, and this suction fan and the blowing fan are combined into a single unit. A cooling device for an overhead type magic lantern according to any one of claims 1 to 3, which is fixed to a drive shaft.