TWI385477B - Image pickup apparatus - Google Patents

Description

Imaging device

The present invention relates to an image forming apparatus applied to the field of optical imaging.

The shutter is a device that controls the effective exposure time of the photosensitive device (such as a photosensitive film, image sensor, etc.). Before the shooting, the shutter is closed, which prevents the photosensitive device in the camera from being exposed; when shooting, adjust the shutter speed and press The shutter release button (ie, the camera button) of the lower camera allows the light passing through the photographic lens to pass through the shutter to the photosensitive device at the moment the shutter is opened and closed, thereby exposing the photosensitive device in the camera.

Common digital cameras and camera shutters use a mechanical structure, such as switching the shutter with a stepper motor and mechanical motion, or switching the shutter with a relay to drive the shrapnel, or switching the shutter with a mechanical curtain. However, such mechanical shutters require a complicated and precise mechanical structure design, which is expensive, and generates noise during operation due to mutual friction of the components.

In view of the above, it is necessary to provide an image forming apparatus which has the characteristics of simple structure, low cost, and no noise.

Hereinafter, an image forming apparatus having a simple structure, low cost, and no noise will be described by way of embodiments.

An imaging device includes an imaging lens module, an image sensor on the image side of the imaging lens module, and a shutter structure between the imaging lens module and the image sensor, the shutter structure comprising: a cavity Package a light incident surface, a light exit surface opposite to the light incident surface; a magnetic fluid contained in the cavity, the magnetic fluid comprising a plurality of magnetic particles coated with a surfactant and a transparent carrier liquid; a magnetic field generating device disposed only on one side of the cavity, wherein the magnetic particle is uniformly dispersed in the transparent carrier liquid when the magnetic field generating device is in a closed state, and the magnetic field generating device is in an open state And the magnetic particles are collected in a cavity close to the magnetic field generating device; and a heating unit disposed on the other side of the cavity for heating the magnetic particles.

Compared with the prior art, the image forming apparatus accommodates a large amount of magnetic fluid composed of a surfactant-coated magnetic particle and a transparent carrier liquid in a cavity, and the magnetic field is generated by switching the magnetic field generating device to change the magnetic particle. The distribution in the transparent carrier liquid is used to control the passage of light, thereby realizing the effect of the shutter, which has the characteristics of simple structure, low cost and no noise.

The invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2 , an embodiment of the present invention provides an imaging device 100 including a shutter structure 10 , an imaging lens module 20 , and an image sensor 30 . The shutter structure 10 is located between the imaging lens module 20 and the image sensor 30.

The shutter structure 10 includes a cavity 12, a magnetic fluid 14 and a magnetic field generating device 16.

The cavity 12 is a closed cavity including a light incident surface 122, and the light is emitted. Face 124, and a plurality of side walls 126. The light exit surface 124 is disposed opposite to the light incident surface 122. The sidewall 126 is located between the light incident surface 122 and the light exit surface 124 and is adjacent to the light incident surface 122 and the light exit surface 124. The light incident surface 122 and the light exit surface 124 are light transmissive; and the material of the sidewall 126 is preferably an opaque material.

The magnetic fluid 14 is housed within the cavity 12. The magnetic fluid 14 includes a plurality of magnetic particles 142 and a transparent carrier liquid 144. The magnetic particles 142 are coated with a surfactant which is uniformly distributed in the transparent carrier liquid 144 without agglomeration. The magnetic particles 142 may be selected from black magnetic particles such as triiron tetroxide or manganese zinc ferrite magnet, and the particle size thereof is preferably from 1 to 100 nm, and more preferably, the particle size is from 15 to 25 nm. The content of the magnetic particles in the magnetic fluid 14 is preferably 0.01 to 20% by weight (by weight). The transparent carrier liquid 144 may be a transparent liquid substance such as water, ethanol, methanol, cyclohexane or n-octane. The surfactant may be selected from a polymer material such as polyvinyl alcohol, oleic acid, linoleic acid or olive oil.

The magnetic field generating device 16 is disposed in the sidewall 126 of the cavity 12 to control the distribution state of the magnetic particles 142 in the transparent carrier liquid 144 by switching the magnetic field generating device to generate a magnetic field. The magnetic field generating device 16 may include an electromagnet and a power supply device (not shown) for supplying power to the electromagnet to cause the electromagnet to generate a magnetic field. Of course, as shown in FIG. 3, the magnetic field generating device 16 can also be disposed outside the side wall 126 of the cavity 12.

The imaging lens module 20 includes a lens barrel 220, lenses 221, 222, an aperture sheet 224, a filter 226, a spacer ring 228, and a base 229. The lens barrel 220 is used for housing the lenses 221, 222, the aperture plate 224, and the filter 226. Spacer ring 228 and base 229. The lenses 221 and 222 are housed in the lens barrel 220 for collecting light reflected by the object to form an image. The aperture plate 224 is disposed between the lens 221 and the lens 222 for controlling the luminous flux of the imaging lens module 20. The filter 226 is disposed on one side of the lens 222 away from the aperture sheet for turning off light of a certain wavelength band. The spacer ring 228 is disposed between the lens 222 and the filter 226 for separating the lens 222 and the filter 226 by a certain distance to prevent contact or collision between the two to cause damage. The base 229 is configured to carry a lens barrel 220 that is coupled to the lens barrel 220 by threads and houses the lens barrel 220 therein.

The image sensor 30 is disposed on the image side of the imaging lens module 20 and is received in the pedestal 229. The image sensor 30 can be a charge coupled device (CCD) sensor or a complementary metal oxide semiconductor (Complementary). Metal-Oxide Semiconductor, CMOS) sensors, etc.

The magnetic particles 142 in the cavity 12 are uniformly dispersed in the transparent carrier liquid 144 before the object is photographed. Since the magnetic particles 142 are black particles having light absorbing characteristics, the light incident into the cavity 12 from the side of the light incident surface 122 is absorbed by the magnetic particles 142 during the passage of the magnetic fluid 14 and cannot reach the light. Exit surface 124. At this time, the shutter structure 10 can block the light from the imaging lens module 20 to prevent the image sensor 30 from being sensitive.

When photographing an object, the image forming apparatus 100 has two working states:

(a) A first state, see Fig. 1, to supply power to the magnetic field generating device 16, which will generate a magnetic field to magnetize magnetic particles 142 suspended in the transparent carrier liquid 144, thereby causing the magnetic particles 142. Gathered to The cavity 12 is adjacent to the side wall 126 of the magnetic field generating device 16 side, and the other location within the cavity 12 is a transparent carrier liquid 144. The light incident into the cavity 12 from the light incident surface 122 side passes through the transparent carrier liquid 144 to the light exit surface 124 and is emitted from the light exit surface 124. At this time, the light from the imaging lens module 20 can reach the image sensor 30 and sensitize the image sensor 30.

(b) a second state, see Fig. 4, to stop supplying power to the magnetic field generating device 16, since the magnetic field generating device 16 does not generate a magnetic field, the magnetic particles 142 in the cavity 12 will immediately demagnetize and return to the original state, The magnetic particles 142 are uniformly dispersed in the transparent carrier liquid 144. The light incident into the cavity 12 from the side of the light incident surface 122 is absorbed by the magnetic particles 142 during the passage of the magnetic fluid 14 and cannot reach the light exit surface 124. At this time, the shutter structure 10 blocks the light from the imaging lens module 20, and the image sensor 30 is light-sensitive.

Thus, by controlling the power supply to the magnetic field generating device 16, the shutter structure 10 can be selectively placed in the first state or the second state, thereby allowing or prohibiting the passage of light to achieve the shutter function.

Preferably, the imaging device 100 can also be configured with a heating unit 26, which can be a resistance wire or the like, which can be disposed in the cavity sidewall 126 of the shutter structure 10. When the power supply to the magnetic field generating device 16 is stopped, the heating unit 26 is energized to cause the heating unit 26 to generate heat to heat the magnetic fluid 14, thereby accelerating the demagnetization of the magnetic particles 142 to be more evenly dispersed in the transparent carrier liquid 144.

The imaging device 100 provided by the embodiment of the present invention, which will have a large amount of surface active The magnetic fluid 14 composed of the magnetic agent coated 142 and the transparent carrier liquid 144 is accommodated in the cavity 12, and the distribution of the magnetic particles 142 in the transparent carrier liquid 144 can be changed by switching the magnetic field generating device 16 to generate a magnetic field. The condition is used to control the passage of light, thereby realizing the effect of the shutter, which has the characteristics of simple structure, low cost and no noise.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims.

100‧‧‧ imaging device

10‧‧‧Shutter structure

12‧‧‧ cavity

122‧‧‧Light incident surface

124‧‧‧Light exit surface

126‧‧‧ side wall

14‧‧‧Magnetic fluid

142‧‧‧Magnetic particles

144‧‧‧Transparent carrier liquid

16‧‧‧Magnetic field generating device

20‧‧‧ imaging lens module

220‧‧‧Mirror tube

221, 222‧ ‧ lens

224‧‧‧ aperture film

226‧‧‧Filter

228‧‧‧ spacer ring

229‧‧‧Base

26‧‧‧heating unit

30‧‧‧Image Sensor

FIG. 1 is a schematic diagram of an image forming apparatus according to an embodiment of the present invention in a first state.

2 is a schematic view showing the structure of a shutter of an image forming apparatus according to an embodiment of the present invention.

FIG. 3 is a schematic structural view of a shutter according to another embodiment of the present invention.

4 is a schematic view showing the image forming apparatus of FIG. 1 in a second state.

100‧‧‧ imaging device

122‧‧‧Light incident surface

124‧‧‧Light exit surface

16‧‧‧Magnetic field generating device

20‧‧‧ imaging lens module

220‧‧‧Mirror tube

221, 222‧ ‧ lens

224‧‧‧ aperture film

226‧‧‧Filter

228‧‧‧ spacer ring

229‧‧‧Base

26‧‧‧heating unit

30‧‧‧Image Sensor

Claims (10)

An imaging device includes an imaging lens module, an image sensor on an image side of the imaging lens module, and a shutter structure between the imaging lens module and the image sensor, wherein the shutter structure comprises: a cavity The body comprises a light incident surface, a light exit surface opposite to the light incident surface; a magnetic fluid contained in the cavity, the magnetic fluid comprising a plurality of surfactant-coated magnetic particles and a transparent a carrier liquid; only one magnetic field generating device is disposed only on one side of the cavity, and when the magnetic field generating device is in a closed state, the magnetic particles are uniformly dispersed in the transparent carrier liquid, and the magnetic field generating device In the on state, the magnetic particles are concentrated in a cavity close to the magnetic field generating device; and a heating unit disposed on the other side of the cavity for heating the magnetic particles. The image forming apparatus according to claim 1, wherein the material of the magnetic particles is selected from the group consisting of triiron tetroxide and manganese zinc ferrite magnets. The image forming apparatus according to claim 1, wherein the magnetic particles have a particle diameter ranging from 1 to 100 nm. The image forming apparatus according to claim 3, wherein the magnetic particles have a particle diameter ranging from 15 to 25 nm. The image forming apparatus according to claim 1, wherein the magnetic fluid has a weight ratio of magnetic particles of 0.01 to 20% by weight. The image forming apparatus of claim 1, wherein the transparent carrier liquid is selected from the group consisting of water, ethanol, methanol, cyclohexane, and n-octane. The image forming apparatus according to claim 1, wherein the surfactant is selected from the group consisting of polyvinyl alcohol, oleic acid, linoleic acid, and olive oil. The image forming apparatus according to claim 1, wherein the magnetic field The generating device includes an electromagnet. The image forming apparatus of claim 1, wherein the cavity further comprises a sidewall disposed between the light incident surface and the light exiting surface, the heating unit being disposed in the sidewall. The image forming apparatus of claim 9, wherein the heating unit is a resistance wire.