JPS5823010A - Lighting method - Google Patents

Abstract

PURPOSE:To minimize the loss of the quantity of light, and to obtain lighting with a uniform illuminance distribution through simple structure, by arranging a treated photosensitive medium, obtaind in a prescribed way, between a light emitting body and a photodetection surface. CONSTITUTION:A shutter 6 is opened for a prescribed time to irradiate a photosensitive medium 4 with light from a light emitting body 1 through a condenser lens 2. The medium 4 is detached and development and fixation are performed to obtain a pattern blackened in proportion to the quantity of exposure on the medium 4. The photosensitive medium 4 is fitted to a photosensitive medium fixture 5 again in the same state. Luminous flux with a spatially uneven distribution from the light emitting body 1 is passed through the medium 4 to obtain lighting with nearly uniform illuminance on a photodetection surface 3. The loss of the quantity of light due to the deviation of the photosensitive characteristics of the medium 4 from linearity is relatively small as compared with that when an ideal photosensitive medium is used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a II brightness method and illumination device that supplies constant omrit to any location on a light-receiving surface having a finite size. When the light receiving surface is irradiated, the light emitting body exhibits a finite amount of heat, and since the brightness of each light body is uneven, it is necessary to irradiate the light receiving surface with uniform illuminance. is not possible)
Conventionally, as a countermeasure against O, there is a method of inserting a diffusion plate that has the effect of diffusing light between the emitter and the light receiving surface, or an optical fiber bundle in which the position O of each fiber at the entrance and exit is intentionally made irregular. A method is known in which the optical fiber bundle is inserted between a light emitter and a light receiving surface, and the screen is irradiated with light through the bundle of optical fibers. However, in the former method using a diffuser plate, there is a large loss of irradiation energy due to light scattering, and in the latter method using an optical fiber bundle, the length of the optical fiber bundle becomes long due to manufacturing reasons. A disadvantage is that the entire device becomes large.

An object of the present invention is to provide an illumination method that eliminates such drawbacks, minimizes the loss of irradiation energy, can be configured with a simple structure, and provides a uniform am.
4 devices.

According to the present invention, the photosensitive medium t is placed between the light emitter and the light receiving surface in advance.
- After exposing the photosensitive medium to the light emitted from the light emitting body, developing and fixing it, the light emitted from the light emitting body can be transferred to the photosensitive medium by mounting it again at the same position as when it was exposed. A method and apparatus are obtained in which the illuminance is uniformed after passing through the .

In the off-bright method, when the positional relationship between the light emitting body and the light receiving surface to be illuminated is fixed, the crystallization density change rate is is approximately equal to 1 and has a photosensitive characteristic with a small fog density, the photosensitive medium is exposed to light from the luminescent material for a predetermined period of time, and the photosensitive medium is processed to blacken in proportion to the amount of exposure light. The photosensitive medium is placed at the photosensitive medium fixing position again, and the light-receiving surface is irradiated with light from the light emitter through the cough photosensitive medium.
In the IWA method and the m#4 device, the device consists of a light emitter and a photosensitive medium produced by the illumination method.

An embodiment of the present invention will be explained below with reference to Fig. 1, Fig. 2, and Fig. jI3.〇 Fig. 1 is a configuration diagram showing an embodiment of the present invention.

Light emitter 1. Condenser lens λ photosensitive medium fixture 5
is placed on the optical axis. Furthermore, condenser lens 2
A shutter is placed on the optical axis between the photosensitive medium fixing device 50 and the scissors shutter 6, and the photosensitive medium 4 is fixed to the photosensitive medium fixing device 5 with the scissors shutter 6 closed. In this state, shutter 6
is opened and closed for a predetermined time, and the photosensitive medium 4 is fixed to the photosensitive medium A.
When the photosensitive medium 4 is removed from the photosensitive medium 4 and subjected to development and fixing processes, a blackened pattern is obtained on the photosensitive medium 4 in proportion to the amount of exposure light. The wrinkled photosensitive medium 4 is again attached to the photosensitive medium fixing tool 5.
If the luminous body 1 is installed in the same position, the 4jO luminous flux due to the spatial non-uniformity of the light emitting body 1 will be greatly reduced when it passes through the photosensitive medium 4, and the luminous flux in the high II degree part will be greatly attenuated, and the luminous flux in the low illuminance part will be greatly attenuated. The luminous flux is converted into a relatively unattenuated luminous flux, and the received light WJ
3. Uniform bright light can be obtained on the upper side.

Diagram 2 is a characteristic diagram for explaining the characteristics required of the photosensitive medium in order to obtain a more uniform illuminance distribution on the light-receiving surface in this embodiment.

Here, the horizontal axis is the common logarithm of the irradiation energy when exposing the photosensitive medium, and the vertical axis is the transmission degree II. - In the emulsion-based photosensitive medium, the pattern has a straight line @ a - b of a relatively wide range WA as shown in Fig. 112, and the #i tightening part a - b
The slope of is called the crystallization concentration change rate, and is generally expressed as r('jI
It is called umma). (Hereinafter referred to as r.) Further, it passes through curved portions b-e and reaches nearly horizontal straight portions e-d and fC. Cough direct IIA part e −d O height D・ is called concentration. Here, if the straight line part a-b is [0 and the point where the transmission Il& is zero is , then the straight line 11a-e will be:・・・
...... It is expressed as (1). However, D
is the transmission #Ik degree, and E is the variable indicating the irradiation energy.
is the irradiation energy corresponding to point ISK. In this embodiment, the irradiation energy for exposing the photosensitive medium can be adjusted to the lowest concentration on the photosensitive medium by controlling the emission time OVa to t@.

When the photosensitive medium is exposed with the shutter open time set to -, the immersion degree O at the lowest am on the photosensitive medium becomes zero from equation (1). That is, in the photosensitive medium after development and fixing Oml, the light flux of - illuminance incident on the location with the lowest density exits from the photosensitive medium with equal illuminance and illuminates the light receiving surface.

On the other hand, IIK exposes the photosensitive medium, and the illuminance at any location on the photosensitive medium is! Is it equal to ・■・yo〉high(,kl・(k
≧1). Therefore, the transmission density at any location [D is D −r# kIs to/ &= r bit k
(゛,"1iizI life ts)・(2).On the other hand, the relationship between the permeation degree and the transmittance T is T! 10-"...
・・・・・・・・・・・・・・・・・・・・・・・・
・・・－・・・・・・・・・・・・ Since it is expressed as (b),
The transmittance T at any location after development and fixing is T W 1G''''rkkamIk-'...
・・－・・−・・・・・・・−・・・・・・・・・・ (4
), the illuminance of the transmitted light flux is I!・・T■k ・I・・・・・・・・・・・・・
... (Since it is expressed as 51, if r is -1, it becomes I-I at any location. C13Ji image, O after fixing process.
The light beam from the light emitter that passes through the I&P medium illuminates the light receiving surface with spatially uniform illuminance. However, in an actual photosensitive medium, as shown by the solid line in Fig. 2, there is a straight line part b-e, and a straight part c-d, which deviates from the straight line part 1-, so there is a slight deviation from the O law. You will get results. Therefore, it is desirable that the deviation of the above-mentioned line part S-C from the straight part 凰- is small, and that the degree of transmission of the upper Ki straight I11 part e-4, that is, the degree of covertness is low, so that the actual upward exposure The irradiation energy applied to the lowest illuminance area of the photosensitive medium must be determined depending on the photosensitive characteristics of each photosensitive medium. Now, if we choose the value corresponding to the point / in Figure 2 as the irradiation energy applied to the location with the lowest illuminance O mentioned above, the amount of light that passes through the O photosensitive medium after the fixing process is currently ! 10% across the entire surface of the photosensitive medium compared to the case of a photosensitive medium with ideal linear photosensitive characteristics.
0X (1-10) −〇 loss.

FIG. 3 is an H degree distribution diagram for explaining the effect of the M degree distribution on the light receiving surface obtained by the present example.

and ζ, the horizontal axis is a coordinate axis representing the position on the light receiving surface, and the vertical axis is the illuminance on the light receiving surface. Curve 1 is an example where this embodiment is not applied, and shows that non-uniform illuminance due to non-uniform brightness of the light emitter appears on the light receiving surface. - line B indicates that the photosensitive characteristics of the photosensitive medium used in this example are correct over the entire range! Assuming that the illuminance distribution on the light receiving surface is
It is possible to uniformize and align the illuminance to the lowest value.
In the illuminance distribution when the line c#i bordering on O photosensitive medium is applied to this embodiment, the ratio Is/L to amBom*g is approximately 101·. For example, in the case of D1m8.2, Is/Ii is 79%] even when compared with a good case using a photosensitive medium with ideally linear photosensitivity characteristics.
A uniform illuminance distribution can be obtained with - loss of light quantity.

As described above, according to the present invention, it is possible to minimize the loss of light quantity O and obtain illumination with a uniform illuminance distribution in a borderline structure.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, and Fig. 2 shows the necessary conditions of the present invention. For clarity, Figure 041 and Figure 3 are illuminance distribution diagrams for explaining the t)911 effect of the present invention. 1... Light emitter, 2... Condensing lens, 3... Light receiving surface, 4... Photosensitive medium,
5...Photosensitive medium identification odor, 6...Shutter. 1N1 Pavilion Figure 1 Figure Z Pavilion Figure 3

Claims (1)

[Claims] In an illumination method in which the positional relationship between a light emitter and a light-receiving surface illuminated by the light-emitting body is fixed, the medium is placed at a predetermined fixed position on the optical axis between the light-emitting body and the light-receiving surface. A photosensitive medium having photosensitive characteristics in which the rate of change in degree is approximately equal to 1 and the degree of change in degree is small is placed, exposed to light from the light emitting body for a predetermined time, and the photosensitive medium is processed and exposed. A blackened pattern is produced in proportion to the amount of light, and the #treated photosensitive medium is placed again at the medium fixing position, and the light-receiving surface is irradiated with light from the light emitting body through the processed photosensitive medium. A light method characterized by uniformly irradiating the upper surface.