JPS5831571B2 - optical device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical device having a heat generating light source arranged in a closed housing cooled by a ventilator.

In optical devices such as overhead projectors and phantom lanterns, a significant amount of heat is generated by a powerful light source and must therefore be dissipated from the optical device.

For typical optical devices, an axial or mixed flow blower supplies cooling air into the housing and expels heated air from the housing.

However, such known solutions have the disadvantages of insufficient light shielding, considerable noise generation and low cooling effectiveness.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an optical device that has an excellent cooling effect, is well shielded from light, and at the same time maintains a low noise level.

The problem of the invention is solved by using centrifugal impellers for cooling.

By using a centrifugal impeller, the light inside the optical device can be appropriately shielded, the cooling capacity can be improved, and the generation of noise can be reduced.

Furthermore, the space occupied by the device can be saved.

Next, a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 3.

In the embodiment shown in FIG. 1, the invention is shown as an overhead projector.

A centrifugal impeller 3 is embedded in the side wall 1 of the housing 2.

The housing includes components of the optical device that are exposed to high temperatures;
For example, a lamp and a presnel lens are provided.

In the embodiment shown in FIG. 1, the drive motor 4 is partially recessed into the housing of the centrifugal impeller, so that the installation of the centrifugal impeller can be made narrow.

This installation width can be further reduced if the motor is completely housed in the centrifugal impeller.

The intake of air takes place in the axial direction of the centrifugal impeller through an inlet 5, as indicated by the arrow, and the air can be discharged radially from the side of the side wall 1.

Therefore, on the side wall 1 having a large surface area,...Using 2
There is no need to provide an air outlet that allows light to leak from inside the device.

Large diameter centrifugal impellers are less noisy compared to other types of fans by providing the same size air intake, and therefore operate quietly when providing the same cooling capacity, while conversely reducing noise levels. If they are kept the same, the cooling capacity can be increased.

Compared to common types of ventilation devices that use axial flow enclosures or mixed flow blowers, this centrifugal impeller provides superior air performance, especially when used with an air conducting helical wall.

Even if the air resistance in the air intake lower or outlet section of the centrifugal impeller is increased by modifying the optical device, there is no risk that the air intake will be significantly reduced when according to the invention.

As is clear from FIG. 2, a partition wall 8 is provided between the side wall 1 and the intake port 5 to separate the intake space from the pressure space.

At least one side of the side wall 1 is provided with a grill-shaped grate through which the heated cooling air is dissipated.

Furthermore, an air conduction wall 6 can be inserted between the side wall 1 and the partition wall 8.

In the embodiment shown in FIG. 2, the air conducting wall 6 is in the form of a double air conducting spiral.

This air-conducting helical wall also has the effect of increasing the effectiveness of the inserted centrifugal impeller and reducing noise.

FIG. 3 shows an embodiment of another type of centrifugal impeller 3.
In this version, the bearing bracket of the drive motor 4 is screwed onto a bridging member 9 extending over the air intake lower in the bulkhead 8, and the centrifugal impeller is mounted on the rotor shaft 10.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment in which the present invention is applied to an overhead projector; FIG. 2 is a perspective view of one wall of the overhead projector shown in FIG. 1; FIG. 3 is a perspective view of one wall of the overhead projector shown in FIG. FIG. In the figure, 1 is a side wall, 2 is a nozzle, 3 is a centrifugal impeller, 4 is a motor, 5 is an intake port, 6 is an air conduction wall, 7 is an intake port, 8 is a partition wall, 9 is a bridge member, 10 is a rotation It is a child axis.

Claims (1)

Claims: 1. An optical device comprising a heat-generating light source disposed in a housing 2 cooled by a ventilator, the walls of the housing 2 at least partially surrounding the light source, wherein the ventilator is The centrifugal impeller 3 includes:
The centrifugal impeller 3 is disposed on or between the walls 1 and 8 of the housing 2, and the rotating surface of the centrifugal impeller 3 is oriented in the same plane as the wall to which it is attached. optical device. 2. The optical device according to claim 1, wherein the housing 2 comprises a wall having inner and outer surfaces 1.8 spaced apart from each other, and the centrifugal impeller 3 has inner and outer surfaces 1,8 of the wall. An optical device characterized by being installed between. 3. In the optical device according to claim 1 or 2, an air conduction wall 6 is provided near the centrifugal impeller 30, and the air conduction wall 6 cooperates with the centrifugal impeller 3. An optical device characterized in that it guides air released from the centrifugal impeller 3. 4. In the optical device according to claim 3,
An optical device characterized in that the air conduction wall 6 is provided between spaced apart wall surfaces of the housing 2, and the centrifugal impeller 3 is also provided between the spaced apart wall surfaces of the housing 2. .