JPH03214974A - Line sensor scanning type camera - Google Patents

Abstract

PURPOSE:To eliminate the need for a large scale lighting device and to make the entire system including a camera small by providing a light source emitting a light of slit shape and moving the slit light from the light source while irradiating only a pickup object position of an object synchronously with the movement of a line sensor. CONSTITUTION:A slit light source 4 is arranged at a position in conjugation with an image forming face at a line sensor 3 with respect to an image pickup lens 1 at the back of a beam splitter 2. A light having a width passes through the beam splitter 2 from the slit light source 4 and the slit light is emitted on a part picked up by the line sensor 3 on an object 18 through an image pickup lens 1. Moreover, the slit light source 4 is moved by a moving stage 6 while keeping a position in conjugation with the line sensor 3. Then while only the part picked-up for the object 18 is moved, the part is lighted by the image pickup lens 1 through the beam splitter 2. Thus, the power of the light source is reduced without emitting useless light to parts other than the picked-up part of the object.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a line sensor scanning camera that reads a two-dimensional image of a subject by moving and scanning a line sensor in which a plurality of light-receiving pixels are arranged one-dimensionally.

[Conventional technology] Conventionally, as a camera that obtains detailed still screen image information,
Line sensor scanning is a line sensor in which a line sensor with a one-dimensional arrangement of multiple light-receiving pixels is movably arranged on the imaging plane of the object image formed by the photographing lens, and two-dimensional image information is captured by scanning as the line sensor moves. The type is known as Mela.

In such a line sensor type camera, it is possible to read and scan a subject image with a wide angle of view with a large subject imaging plane, so that high-definition image data can be obtained.

[Problems to be Solved by the Invention] However, in such a conventional line sensor type camera, for example, the line sensor type camera 10 is set on the stand 16 of the photographing table 14 shown in FIG. 2(a). When photographing or studio photography as shown in FIG. 2(b), the lighting device 12 is large-scale in order to illuminate the entire subject evenly, and the device as a whole is large and has poor portability, and also has the problem of high power consumption. was there.

The present invention has been made in view of these conventional problems, and an object of the present invention is to provide a line sensor scanning camera that can capture high-definition image information with a simple configuration.

[Means for Solving the Problems] To achieve this object, the present invention is configured as follows. In addition, the reference numerals in the drawings of the embodiments are also shown.

First, the present invention utilizes line sensor scanning, in which two-dimensional image information is captured by scanning an object image formed by a photographing lens 1 on an imaging plane as the line sensor 3 moves in one-dimensional arrangement with a plurality of light-receiving pixels. Target type cameras.

In the present invention, for such a line sensor scanning camera, there is provided a light source 4 that irradiates a slit-shaped light provided at a position conjugate with the line sensor 3 to the photographing lens 1; a beam splitter 2 that separates the light from the subject that is imaged on 3 and the light irradiated from the light source 4 to the subject through the photographing lens 1; A light source driving means 6 is provided for irradiating a slit-shaped light onto a position of the subject corresponding to the subject image being read by the line sensor 3.

[Function] According to the line sensor scanning camera of the present invention having such a configuration, the slit light from the light source built into the camera illuminates only the position of the subject to be photographed in synchronization with the movement of the line sensor. As a result, lighting devices that were previously required separately are now built into cameras, eliminating the need for bulky lighting devices and downsizing the entire system including the camera. It can be easily transported.

[Embodiment] FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, 16 is a camera body, and a beam splitter 2 is installed behind the photographic lens 1 attached to the camera body 16 to reflect light from a subject 18 in a right angle direction. The light from the subject 18 reflected by the beam splitter 2 forms a subject image 18' on the imaging plane where the light receiving surface of the line sensor 3 is located. The line sensor 3 has a one-dimensional array of a plurality of light receiving pixels that convert light into electrical signals, and uses, for example, a charge accumulation type CCD line sensor.

The line sensor 3 is moved along the image forming plane by the stage 4, and the two-dimensional image information of the subject image 18' is captured into a memory or the like through reading scanning accompanying this movement.

On the other hand, a slit light source 4 is arranged behind the beam splitter 2 at a position conjugate with the imaging plane on the line sensor 3 side with respect to the photographing lens 1. From this slit light source 4, light with a certain width passes through the beam splitter 2, and the photographing lens 1 irradiates the slit light onto the portion of the subject 18 that is being imaged by the line sensor 3. Also, pickpockets,
The light source 4 is moved by the moving stage 6 while maintaining a conjugate position with the line sensor 3 (synchronized movement), passes through the beam splitter 2, and moves only the portion of the subject 18 being imaged by the photographing lens 1. While lighting.

When photographing using the line sensor scanning camera of the present invention according to the embodiment shown in FIG. 1, the large illumination device 12 shown in the conventional example shown in FIG. The slit light is irradiated onto the subject part that is the shooting position of the line sensor 3, and when shooting starts, the slit light source 4 moves in synchronization with the movement of the line sensor 3, so that the slit light irradiating the subject also moves and shoots. become.

Furthermore, since the slit light is irradiated to the photographing start position of the subject at the start of photographing, positioning for the photographing start can be easily performed.

[Effects of the Invention] As explained above, according to the present invention, illumination light is irradiated onto the imaged portion of the subject by also serving as a photographing lens.
There is no need to irradiate unnecessary light on areas other than the photographed area of the subject, and the light is concentrated only on the necessary areas, improving the efficiency of light use.
The power of the light source can be reduced. Furthermore, since the lighting device can be built inside the camera, there is no need for a separate lighting device, resulting in excellent portability.

Furthermore, it is also effective for subjects that cannot be irradiated with light for a long time.

[Brief explanation of drawings]

FIG. 1 is an embodiment configuration diagram showing one embodiment of the present invention; FIG. 2 is a block diagram of a conventional device. [Explanation of symbols of main parts] 1; Photography lens 2; Beam splitter 3; Line sensor 4; Slit light source 5; Moving stage (for line sensor) 6; Moving stage (for light source) 16: Camera body 18: Subject 18': Subject image

Claims (1)

[Scope of Claims] A line sensor scanning type in which a subject image formed by a photographic lens on an imaging plane is read as two-dimensional image information by scanning as the line sensor moves in one-dimensional arrangement of a plurality of light-receiving pixels. In the camera, a light source that irradiates light in a slit shape provided at a position conjugate with the line sensor with respect to the photographic lens; light from a subject that passes through the photographic lens and reaches the line sensor; a beam splitter that separates the light irradiated from the light source to the subject through the photographic lens; moving the light source in synchronization with the movement of the line sensor;
A line sensor scanning camera comprising: a light source driving means for irradiating a slit-shaped light onto a subject position corresponding to the subject image being read by the line sensor;