CN2849752Y - A pinhole imaging device - Google Patents

Abstract

The utility model discloses a pinhole formula image device, including one allow light to get into optical system and constitute the pinhole formula aperture stop of formation of image, at least a slice is with above-mentioned pinhole formula aperture stop complex optical lens. When light passes through the diaphragm of the pinhole aperture diaphragm, light emitted by a far object and entering the optical system is imaged clearly, and light emitted by a near object and entering the optical system is imaged clearly; the characteristic that the images of the shot objects with different distances can be clear at the same time is achieved; simultaneously, the optical lens who sets up at the pinhole front and back end can effectively overcome the big not enough of ordinary pinhole distortion, makes sensor unit's whole photosensitive area play and accepts the utility model discloses the effect of the image that imaging device becomes.

Description

A pinhole imaging device

technical field

The utility model relates to an imaging device, in particular to an imaging device of a pinhole lens.

Background technique

At present, the imaging device usually adopts an optical lens system for imaging. Only by taking pictures at a fixed shooting distance can a clear imaging result of objects at and near the shooting distance be obtained. That is to say, when shooting an object at a fixed distance, as long as the object is not at this distance, a clear image cannot be obtained. If you want to achieve clear imaging results when shooting objects at different distances, you can only use other mechanical devices, such as auto-focus devices and lens systems with manual focus functions.

With the help of the above-mentioned mechanical device, only a clear image of a certain object at a fixed shooting distance can be obtained. The effect that the imaging results of relatively close objects and relatively distant objects are clear can not be obtained at the same time.

The imaging device with automatic focus and manual focus optical device structure, because of the special mechanical structure of focus and focus function, such as: Step Motor, VCM Actuator, etc., manual focus lever, etc., so its structure is complex and the size is small. Big and expensive. In recent years, there has been a general demand for imaging devices installed on portable electronic devices. Since portable electronic devices are limited by their volume, higher requirements are put forward for the miniaturization and simplification of imaging devices.

Utility model content

The purpose of this utility model is: to provide a non-automatic focus and manual focus optical mechanism to increase the degree of freedom of the shooting distance of the photographed object, so that the imaging results of the photographed object at different shooting distances are clear, and at the same time, high Contrast characteristics, an imaging device for imaging with a small amount of optical distortion.

Another object of the present utility model is to provide an imaging device with simple structure and miniaturization, which is suitable for installation and use of information terminals such as small camera equipment, portable phones (mobile phones), portable computers, and their auxiliary devices.

The utility model is realized based on the principle that pinhole imaging is a great invention of Mozi in ancient my country, and because of its simple adaptability, it still has strong vitality in today's high-tech development. The utility model is a pinhole imaging device designed on the principle of pinhole imaging, including:

A pinhole aperture stop that allows light to enter the optical system to form an image, and the diameter of the pinhole is 0.5mm to 0.9mm;

It has a light-shielding wall that blocks the entry of light from other than the above-mentioned pinhole;

At least one optical lens matched with the above-mentioned pinhole aperture stop;

An optical lens fixing frame extends from the light shielding wall.

The optical lens is one piece, and is arranged on the side of the above-mentioned pinhole aperture stop facing away from the object to be photographed.

There are two optical lenses, which are sequentially arranged on the side of the above-mentioned pinhole aperture stop facing away from the object to be photographed.

There are two optical lenses, one is arranged on the side of the pinhole aperture stop facing away from the object to be photographed, and the other is arranged on the side of the pinhole aperture diaphragm facing the direction of the object to be photographed.

A pinhole lens system:

A pinhole imaging device is installed on a part of the housing, including;

A pinhole aperture stop that allows light to enter the optical system for imaging, and the size of the pinhole diameter is 0.5 mm to 0.9 mm;

It has a light-shielding wall that blocks the entry of light from other than the above-mentioned pinhole;

At least one optical lens matched with the above-mentioned pinhole aperture stop;

A spectacle frame structure for fixing and installing optical lenses.

The image of the above-mentioned imaging device of the pinhole lens is converted into an electronic image signal by a photoelectric converter (such as a CCD photoelectric image sensor or a CMOS photoelectric image sensor, etc.).

The utility model adopts the above-mentioned structure, when the light passes through the aperture of the pinhole aperture diaphragm, the imaging of the light entering the optical system emitted by distant objects and the imaging of light entering the optical system emitted by nearby objects are clear; It can make the images of objects at different distances clear at the same time; at the same time, the optical lens arranged at the front and rear ends of the pinhole can effectively overcome the shortcomings of ordinary pinhole distortion, so that the entire photosensitive area of the sensor unit can play a role in accepting the utility model. The role of the image formed by the imaging device.

Since the utility model does not need an automatic zoom system mechanism and a manual focus system mechanism, it has the advantages of simple structure, small size, long service life and low cost. The imaging device installed and used by the terminal and its auxiliary devices.

In order to obtain the best aperture of the pinhole through the diaphragm, the designer, on the basis of theoretical analysis and research, made a series of experiments on the selection of needle diameters. The diameters are: 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9 mm 1.0mm, the depth of the pinhole is set to 1.0mm ~ 3.0mm, the indoor brightness is set to 100 lux, observe the brightness, distortion, and clarity of the image taken through the corresponding pinhole, and the experimental results shown in Figure 5 are obtained :

When the opening diameter of the pinhole is set to be less than 0.7mm, it is found that the obtained image is clear, but at the same time distortion occurs, an image with insufficient brightness caused by insufficient light is obtained;

When the opening diameter of the pinhole is set above 0.9mm, the image will be blurred. The reason is that the opening diameter is too large and the astigmatism in the pinhole;

When the opening diameter of the pinhole is set at about 0.8mm, the obtained image can obtain a sufficient amount of light, so an image without distortion can be obtained.

It can be seen from the above analysis experiments that the diameter of the pinhole of the present invention is 0.7-.09mm, and the image obtained under the condition of 0.8mm is the best.

The utility model is described further in conjunction with accompanying drawing and embodiment:

Accompanying drawing 1, the structural schematic diagram of Embodiment 1 of the pinhole imaging device of the present invention;

Accompanying drawing 2, the structural schematic diagram of Embodiment 2 of the pinhole imaging device of the present invention;

Accompanying drawing 3, the mobile phone structure schematic diagram that the utility model is installed with pinhole type imaging device;

Accompanying drawing 4, the utility model is equipped with the hole type imaging device part structural schematic diagram of the mobile phone of pinhole type imaging device;

Accompanying drawing 5, the utility model aperture selection experiment result list.

Detailed ways

Embodiment 1, as shown in accompanying drawing 1, is a two-chip optical lens pinhole imaging device, the front end of body 5 has a pinhole 4 with a diameter of 0.8mm, and the depth of pinhole 4 is 2mm; The end expands into a lens barrel 51 with a large diameter, and expands into an accommodating space 52 for a photoelectric conversion sensor 1 with a large diameter at the rear end of the lens barrel 51; The conversion sensor 1 is installed in the accommodating space 52; the body 5 is made of an opaque material integrally formed to form a light-shielding wall that blocks light from entering the pinhole.

When in use, when the light emitted by the subject within the field of view angle range enters the optical lens 3 through the pinhole 4 (the subject and the background), it is concentrated by the optical lenses 3 and 2 and imaged on the photoelectric conversion sensor 1 . Since the diameter of the pinhole unit is 0.8mm, according to the principle of pinhole imaging, objects that are very close to the imaging device and objects that are far away from the imaging device can be clearly imaged on the photoelectric conversion sensor 1 at the same time. It solves the problem that other imaging devices can only clearly image objects at a certain fixed shooting distance.

Embodiment 2, as shown in Figure 2, is another embodiment of the pinhole imaging device of the present invention. The difference from Embodiment 1 is that the positions of the two optical lenses 2 and 3 are different. The optical lens 2 is embedded in the front end of the body 5, and a pinhole 4 with a diameter of 0.75 mm is coaxially opened thereafter, and the depth of the pinhole 4 is 3 mm; the rear end of the pinhole 4 expands into a lens barrel 51 with a large diameter, The accommodating space 52 of the photoelectric conversion sensor 1 that expands into a large diameter at the rear end of the lens barrel 51; the optical lens 3 is embedded in the lens barrel 51 by the rear part of the body 5; the photoelectric conversion sensor 1 is installed in the accommodating space 52; 5 is made by integral molding of opaque material, forming a light-shielding wall that blocks the entry of light from other than the above-mentioned pinholes.

Embodiment 3, as shown in accompanying drawings 3 and 4, is an embodiment in which the pinhole imaging device of the present invention is used as a mobile phone imaging device.

The mobile phone has a display unit 11 , an operation unit 12 , and a pinhole unit 15 arranged on the front of the casing 10 .

Pinhole unit 15; its upper end surface has a pinhole 19 with a diameter of 0.8mm, the depth of the pinhole 19 is 1mm, and the convex lens 16 is attached to the side of the pinhole aperture diaphragm facing away from the direction of the object to be photographed; in the pinhole A part below the unit 15 defines a CCD image sensor accommodation space; the CCD image sensor 18 includes: a filter glass 181 and a sensor unit 182;

The main board 17 of the mobile phone is equipped with a corresponding signal processing circuit that can store the image data generated from the image signal captured by the CCD image sensor 18 , or transform the image data into words to display the image data on the display unit 11 .

In order to effectively utilize the entire area of the sensor unit 182, a single-side aspheric convex lens 16 is embedded behind the pinhole unit 15 to collect light. The convex lens 16 can be made of plastic, hard glass and other materials.

For the glass portion 181 provided on the CCD image sensor 18, a cover glass that changes color according to light (the amount of ultraviolet light) is used. When avoiding to use common glass, produce the phenomenon of burning (becoming brown) by the effect of the light incident from convex lens 16, not only can reduce the quality of image, but also easily shorten the service life of CCD image sensor 18.

When in use, the video (subject and background) light taken in by the pinhole unit 15 on the mobile phone is incident on the convex lens 16, and the convex lens 16 passes through the CCD image on the main substrate 17 of the mobile phone in an afocal state. The glass portion 181 of the sensor 18 is incident on the sensor unit 182 . Through the signal processing circuit, the image can be clearly displayed on the display unit 11 and stored in the chip of the mobile phone.

Since the pinhole unit 15 is a pinhole aperture diaphragm with a diameter of 0.8 mm, objects close to the mobile phone and objects far away from the mobile phone can be clearly imaged on the sensor 18 at the same time, so that they can be clearly displayed on the display unit 11 .

The above-mentioned embodiments are only examples of implementing the utility model, but the design concept of the utility model is not limited thereto, and the utility model can be applied to products/equipment or instruments that require optical imaging. Any non-substantial modification of the utility model shall be an act of violating the protection scope of the utility model.

Claims (9)

1. A pinhole imaging device, characterized in that: comprising: A pinhole aperture diaphragm that allows light to enter the optical system to form an image, and the diameter of the pinhole is 0.5mm~0.9mm; It has a light-shielding wall that blocks the entry of light from other than the above-mentioned pinhole; At least one optical lens matched with the above-mentioned pinhole aperture stop; An optical lens fixing frame extends from the light shielding wall. 2. The pinhole imaging device according to claim 1, wherein the optical lens is one piece, which is arranged on the side of the pinhole aperture stop facing away from the object to be photographed, and fixed on the optical lens. shelf. 3. The pinhole imaging device according to claim 1, characterized in that: said optical lens consists of two pieces, which are sequentially arranged on the side of the pinhole aperture stop facing away from the object to be photographed, and fixed on the optical lens. Lens holder. 4. The pinhole imaging device according to claim 1, characterized in that: said optical lens consists of two pieces, one is set on the side of the above-mentioned pinhole aperture stop facing away from the object to be photographed, and one is set on the pinhole stop. The side of the hole-type aperture diaphragm facing the direction of the object to be photographed is fixed on the optical lens holder. 5. A pinhole imaging device, characterized in that: A pinhole imaging device is installed on a part of the housing, including: A pinhole aperture diaphragm that allows light to enter the optical system for imaging, and the size of the pinhole diameter is 0.5mm~0.9mm; It has a light-shielding wall that blocks the entry of light from other than the above-mentioned pinhole; At least one optical lens matched with the above-mentioned pinhole aperture stop; A spectacle frame structure for fixing and installing optical lenses. 6. The pinhole imaging device according to claim 5, further comprising: a photoelectric conversion sensor, which may be a CCD photoelectric image sensor or a CMOS photoelectric image sensor. 7. The pinhole imaging device according to claim 6, further comprising: a switching device for switching the image capture speed based on the photoelectric converter, which may be a CCD photoelectric image sensor or a CMOS photoelectric image sensor. 8. The pinhole imaging device according to claim 5 or 6, characterized in that the optical lens consists of two pieces, which are sequentially arranged between the above-mentioned pinhole aperture stop and the photoelectric device, and fixed on the mirror on the frame structure; or one piece is arranged between the above-mentioned pinhole aperture diaphragm and the photoelectric device, and one piece is arranged on the front end of the pinhole aperture diaphragm in the direction of the object to be photographed, and are respectively fixed on the frame structure. 9. The pinhole imaging device according to claim 5 or 6, characterized in that the said optical lens is one piece and is arranged between the pinhole aperture stop and the photoelectric device.

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