JPS6269126A - Measuring instrument for incident light to object - Google Patents

Abstract

PURPOSE:To execute photographing under an optimum condition corresponding to brightness of an object, by using a photometric/colorimetric instrument which can transfer information to a photographing device. CONSTITUTION:At the time of photographing, a photometric/colorimetric instrument is placed in the vicinity of an object, light being roughly equal to light which is made incident on an object is made incident on a sensor 1 and converted to an electric signal, and information related to intensity of light and information related to color are obtained. This electric signal is amplified by an amplifier 2, and thereafter, converted to an information code for showing a photometric or colorimetric data by a signal converter 3, and its measured data is transmitted to a photographing device side by a radio wave, by a transmitter 4 and an antenna 5. Subsequently, the photographing device side receives a signal from the photometric/colorimetric instrument by an antenna 6, converts it to the code information of the photometric or colorimetric data by a receiver 7, converts it to an electric signal through a signal converter 8 and inputs it to a photographing device 9, adjusts automatically a shutter speed, a diaphragm value, etc. of the photographing device 9, or prints its information into a film. In this way, photographing can be executed under an optimum condition corresponding to brightness of the object.

Description

[Detailed Description of the Invention] [Industrial Application Fields] Unexploded 1ffJ measures the intensity and color of the light incident on the subject when photographing with a photographing device such as a still camera or television camera. This invention relates to a device for determining incident light 71+11 on a subject, which transmits data to a photographing device.

[Conventional technology] What is a conventional device for measuring incident light on a subject?

7711 is performed independently near the subject, and its J+lI
Generally, the photographer reads the fixed data and manually sets the parameters of the photographing device.

However, with this method, it is easy to make mistakes in setting the photographic equipment due to misunderstandings on the part of the photographer, and if the amount of light hitting the subject changes drastically, the parameters to be set will also change constantly. It is quite difficult to take pictures. In addition, since the illumination light illuminating the subject is unknown, there are other problems such as the white balance being easily distorted. This eliminates the need to manually set up the photographic device, allowing even beginners to easily take photographs under optimal conditions considering the incident light on the subject, and also makes it possible to use the color temperature data of the illumination light when taking pictures with a television camera. The white balance can be set, and even when taking a photo, the color temperature information of the illumination light imprinted on the film surface can be automatically adjusted to obtain a natural-colored print. An object of the present invention is to provide an incident light measuring device.

[Summary of the invention] The gist of the present invention is to achieve the above objects.

A photographic subject comprising: a photometric colorimeter that measures the intensity or color of light incident on the subject; and an information transmitter that transmits measurement data obtained by the Jll optical colorimeter δ to a photographic device. This is a device for measuring incident light.

[Embodiments of the invention] The present invention will be explained in detail based on illustrated embodiments.

FIG. 1 shows an xtII optical colorimeter placed on the subject side and its a11 constant data information transmission means, and FIG. 2 shows a device on the photographing device side that receives the information. As shown in FIG. 1, the full photocolorimetric device placed near the subject includes a sensor 1 that converts the intensity and color of light incident on the subject into electrical signals, and an amplifier 2 that amplifies the converted electrical signals. and a signal converter 3 that converts the strength of the amplified electric signal into an information code representing it, and the encoded information is transmitted as radio waves to the photographing device side by a transmitter 4 and an antenna 5. It has become.

The photographing device side is provided with an antenna 6 for receiving the radio waves, a receiver 7, and a signal converter 8 for converting the received code information into an electrical signal. is now under control.

When photographing, if a photometric colorimeter is placed near the subject, for example, if the subject is a human being, the device is worn, and almost the same amount of light as that incident on the subject enters the sensor 1 and is converted into an electrical signal. , information about the intensity and color of the light can be obtained. After this electrical signal is amplified by an amplifier 2, it is converted by a signal converter 3 into information code 1- indicating photometric or colorimetric data, and the measured data is transmitted to a transmitter 4. The antenna 5 transmits radio waves to the photographing device side.

On the photographing device side, an antenna 6 receives a signal from a photometric colorimetric device, a receiver 7 converts it into Mll+light or colorimetric data code information, and a signal converter 8 converts it into an electrical signal. and input it into the photographing device 9.1. ) most i
The shutter speed, aperture value, etc. of the cedar device 9 are automatically adjusted, or the information is imprinted on the film.

In the above-described embodiment, the intensity and color information of the illumination light is transmitted to the photographing device using a tunic, and is used as a control signal for the shunter speed II', aperture &i, etc. during photographing, or is used to print the information on the film. However, radio waves are not necessarily used as a means of transmitting information; for example, infrared light or sound waves may be used instead of radio waves.
■It is Noh. If the waveband to be used has a lot of noise, it is more advantageous to use infrared light, ultrasonic waves, or the like.

It is also possible to exchange information between the Jllll light colorimeter and the photographing device, in which case the 'All light colorimeter j6
By determining the time it takes for 71111 to respond.

It is possible to measure the distance between the subject and the photographing device, and it can also be used as a distance measuring device.

[Effect of the invention] As explained below, the incident light J1 on the subject according to the present invention
1 fixed device is a Jllll that can communicate information with the imaging device.
By using the X colorimeter, iMI can be placed near the subject.
By simply arranging the II light JI four-color device, the photographing device can automatically take photographs under optimal conditions according to the brightness of the subject. In addition, color correction is possible by measuring the color of the light illuminating the subject and transmitting it to the photographic device.
Alternatively, it is also possible to save data for later color correction, read the data during laboratory processing, and automatically adjust the data to print in natural colors. Furthermore, distance can also be measured by allowing mutual exchange of information with the photographing device.

[Brief explanation of drawings]

The drawings show an embodiment of a device for measuring incident light on a subject according to the present invention, and FIG. 1 is a block circuit diagram of a transmitting device consisting of a photometric colorimetric device and an information transmitting means, and FIG. 2 is a block circuit diagram thereof. FIG. 3 is a block circuit diagram of a receiving side device. Symbol l is a sensor, 2 is an amplifier, 3 is a signal converter, 4 is a transmitter, 5, 6 is an antenna, 7 is a receiver, 8 is a signal converter, and 9 is a photographing device. Patent applicant Canon Co., Ltd. Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A photometric colorimeter that measures the intensity or color of light incident on a subject, and an information transmission means that transmits measurement data obtained by the photometric colorimeter to a photographing device. A device for measuring light incident on a subject, characterized in that: 2. An apparatus for measuring light incident on a subject according to claim 1, wherein radio waves are used as the information transmission means. 3. An apparatus for measuring light incident on a subject according to claim 1, wherein infrared light is used for the information transmission means. 4. An apparatus for measuring light incident on a subject according to claim 1, wherein ultrasonic waves are used as the information transmission means.