CN113031191A

CN113031191A - Optical focusing device with shake compensation

Info

Publication number: CN113031191A
Application number: CN202011490416.8A
Authority: CN
Inventors: 黄志明; 许价辉
Original assignee: Vasstek International Corp
Current assignee: Vasstek International Corp
Priority date: 2019-12-25
Filing date: 2020-12-16
Publication date: 2021-06-25
Anticipated expiration: 2040-12-16
Also published as: TW202125077A; CN113031191B; TWI721735B

Abstract

The invention relates to an optical focusing device with shake compensation, which mainly comprises a lens component, a prism group and a prism group carrier component for fixing the prism group. The lens assembly is composed of an optical lens and a lens carrier for fixing the optical lens. The prism group is composed of a plurality of single prisms, and the single prisms can form at least light secondary refraction on the arrangement position, so that incident light is converted into emergent light in different directions. The emergent light passes through the optical lens and is projected on the photosensitive element. The prism group carrier assembly comprises a rail device, so that the prism group can move in two axial directions by a preset distance under the driving force of the rail device. And adjusting the driving force according to the shake compensation signal to enable the prism group to generate displacement, so that the incident light generates compensation offset when being emitted to the first single prism, and meanwhile, the opposite emergent light also generates offset relative to the compensation offset when being projected on the photosensitive element, thereby realizing shake compensation.

Description

Optical focusing device with shake compensation

Technical Field

The invention relates to an optical focusing device; in particular to an optical focusing device with shake compensation.

Background

In order to precisely control the positioning of the lens group or the head arm of the hard disk, a Voice Coil Motor (VCM) is usually used to move the lens group or the head arm of the hard disk.

In an optical system, when current passes through the coil, the current generates a propelling force with the magnetic field of the permanent magnet: lorentz Force (according to Fleming's left-hand rule) moves the bearing rigidly connected to the permanent magnet and drives the lens group fixed on the bearing, thereby achieving the purpose of optical zooming and focusing.

The traditional camera module structure cannot meet the requirement of high-power optical zooming due to the trend of thinning the smart phone. In order to solve the above problem, some manufacturers have proposed a periscopic camera, which uses a prism to turn light, so that the structure required for high power optical zooming can be parallel to the mobile phone body, and the module height can be reduced by changing the phase, therefore, the periscopic camera moves to the stage of the mobile phone camera, and the high power zooming becomes possible. Only under the influence that the pixel size of photosensitive element diminishes, optics zoom multiple is bigger, and is more sensitive to vibrations, needs to introduce into the technique of anti-shake at this moment to this compensation hand rocks, and imaging quality is taken a photograph to the stability.

The anti-shake function includes Electronic Image Stabilizer (EIS) and optical anti-shake (OIS) systems. An electronic anti-shake (EIS) system optimizes a digital image (digital image) captured by an image sensor to correct blurred images (blurry images) caused by out of focus due to vibration, but has a limited effect. The optical hand vibration (OIS) IS to add an Image Stabilizer (IS) structure in the camera module, and adjust the relative position between the lens (lens) and the Image sensor (Image sensor) by the compensation signal when the vibration occurs, so as to reduce the occurrence probability of the Image blur.

Disclosure of Invention

The conventional optical anti-shake technology cannot be directly applied to the known periscopic lens, so that the high-quality imaging quality cannot be provided.

Therefore, the present invention provides an optical focusing device with shake compensation, which mainly comprises a lens assembly, a prism set, and a prism set carrier assembly for fixing the prism set. The lens assembly is composed of an optical lens and a lens carrier for fixing the optical lens. The prism group is composed of a plurality of single prisms, and the single prisms can form at least light secondary refraction on the arrangement position, so that incident light is converted into emergent light in different directions. The emergent light passes through the optical lens and is projected on the photosensitive element. The prism group carrier assembly comprises a rail device, so that the prism group can move in two axial directions by a preset distance under the driving force of the rail device. And adjusting the driving force according to the shake compensation signal to enable the prism group to generate displacement, so that the incident light generates compensation offset when being emitted to the first single prism, and meanwhile, the opposite emergent light also generates offset relative to the compensation offset when being projected on the photosensitive element, thereby realizing shake compensation.

The advantages and spirit of the present application may be further understood by reference to the following detailed description and the appended drawings.

Drawings

FIG. 1 is a schematic diagram of an optical focusing apparatus with shake compensation according to the present invention.

FIG. 2 is a schematic diagram of an optical focusing apparatus with shake compensation according to the present invention.

FIG. 3 is a schematic diagram of an optical focusing apparatus with shake compensation according to the present invention.

FIGS. 4A-4B are schematic diagrams of an optical focusing apparatus with shake compensation according to the present invention.

Detailed Description

Referring to fig. 1, fig. 1 is a schematic view of an optical focusing apparatus with shake compensation according to the present invention. As shown in fig. 1, the optical focusing device 10 with shake compensation of the present invention includes a protective housing 101, a prism set 102, an optical lens 103, a lens holder 104, a sphere set 105, magnets 106a to 106d, a sphere 107, a prism holder 108, a round bar 109, a movable holder 110, round bars 111a to 111b, a base 112, a photosensitive element 220, coils 114a to 114c, a PCB 115, position sensing components 116a to 116c, and magnetic conductive discs 117a to 117 c. The prism combination carrier assembly is mainly composed of a prism combination 102 and a prism carrier 108. The optical lens 103 and the lens mount 104 constitute a lens assembly. The base 112 is used to mount the lens assembly and the prism assembly carrier assembly. The driving force for displacing the prism assembly 102 or the lens holder 104 may be a voice coil motor, a memory alloy, or a piezoelectric motor, wherein the magnetic conductive plate 117a and the magnet 106a constitute the voice coil motor for driving the lens assembly, and the plurality of magnetic conductive plates 117b to 117c and the magnets 106b to 106d constitute the voice coil motor for driving the lens assembly. The prism assembly carrier block assembly includes a track arrangement whereby the prism assembly 102 is actuated by a driving force (Lorentz forces in the axial directions of +/-X, +/-Y, etc., when the coils 114 b-114 c are energized by an electric current) to move a predetermined distance in both axial directions. The lens holder 104 for fixing the optical lens 103 can be an integral structure or a separate two-piece structure; the prism combination carrier assembly can also be of an integral structure or a separate two-piece structure with the prism combination.

In order to reduce the friction force of the prism group carrier block assembly and the lens assembly moving on the base 112, it is necessary to design opposite rail devices. The prism group carrier assembly and the lens assembly track device are composed of a spherical ball group 105 and a round rod 109 which are matched singly or in a mixing way. Specifically, the moving medium in the track device for the prism group to perform the predetermined distance in two axial directions may be a plurality of round rods, a plurality of round balls, or a single round rod matched with a single round ball or a plurality of round balls, wherein the round rods or the round balls may be made of metal or nonmetal materials.

The magnets and the magnetic conductive disc have attractive force with each other, so that the prism group carrier block assembly and the lens assembly are attracted and attached to the base 112, and the driving force is larger than the attractive force to enable the prism group carrier block assembly and the lens assembly to move for the preset distance. It should be noted that the size of the magnetic conductive disk (which is positively correlated with the magnetic attraction of the magnet) is correlated with the weight of the moving assembly (the magnetic attraction attracts the sliding member to abut against and prevent the sliding member from separating from the sliding member, thereby affecting the imaging quality), the size and shape of the magnetic conductive disk can be adjusted according to the weight of the moving assembly in practical operation, and the magnetic conductive disk is disposed below the magnet, thereby easily generating the magnetic attraction (the attraction is inversely proportional to the square of the distance).

Referring to FIG. 2, FIG. 2 is a schematic view of an optical focusing apparatus with shake compensation according to the present invention. As shown in fig. 2, the prism group 102 is composed of a plurality of individual prisms 102a to 102 b. The plurality of single prisms 102 a-102 b can form at least a secondary refraction of light at the arrangement position, so that the incident light 201 is converted into the emergent light 202 with different directions. The outgoing light 202 is projected on the light-sensing element 220 through the optical lens 103. Here, the first prism 102a of the plurality of prisms 102 a-102 b that receives the incident light is defined as the first prism 102a, and the first prism 102b that receives the light from the first prism 102 a. It should be emphasized that the number of the single prisms depends on the optical path design, and for the sake of convenience of illustration, the embodiment of the present invention is described with two single prisms, but is not limited to be composed of only two single prisms.

Briefly, in the optical focusing device 10 with shake compensation according to the present invention, the prism set 102 is driven by the driving force to move along two axes by a predetermined distance by the rail device while the prism set is maintained on the same plane when moving along the two axes. When the mobile phone shakes, the gyroscope sensing, the Image Signal Processor (ISP), the position sensing components 116a to 116c and the related algorithm are used to generate a shake compensation Signal in cooperation, so that the optical focusing device 10 including shake compensation according to the shake compensation Signal adjusts the driving force, so that the prism set 102 generates displacement, the incident light 201 generates compensation offset when being directed to the first single prism 102a, and the opposite emergent light 202 generates offset relative to the compensation offset when being projected on the photosensitive element 220, thereby realizing shake compensation.

Referring to FIG. 3, FIG. 3 is a schematic view of an optical focusing apparatus with shake compensation according to the present invention. As shown in fig. 3, in the present embodiment, the number of the single prisms is two, and the single prisms include a first single prism 102a and a second single prism 102b, and both the first single prism 102a and the second single prism 102b can emit light substantially perpendicularly. The incident light 201 entering the first single prism 102a will fall at the light incident position 102a1, and then the light is reflected to enter the light incident position 102b1 on the second single prism 102b, and is substantially perpendicular to the outgoing light 202 reflected by the second single prism 102b, so that the incident light 201 is converted into the outgoing light 202 with different directions, and finally the outgoing light 202 will pass through the optical lens 103 and be projected on the photosensitive element 220.

When the mobile phone shakes and generates the required compensation signal, the optical focusing device 10 with shake compensation of the present invention adjusts the driving force according to the shake compensation signal, so that the prism set 102 moves. That is, the prism assembly 102 can move along the first axial direction (X direction) or the second axial direction (Y direction), but it should be noted that the X direction and the Y direction can be performed sequentially or synchronously, and the offset compensation effect caused by the movement of the prism assembly 102 in the X direction and the Y direction will be described below.

As shown in fig. 3, when the prism group 102 moves along the first axial direction (X direction), because the reflecting surface of the second single prism 102b is an inclined surface, the incident light 201 directed to the first single prism is displaced parallel to the second axial direction (Y direction), that is, the original light path 202a is changed into the light path 202b, so as to generate the compensation offset of T 'in the second axial direction (Y direction), and the emergent light 202 projected on the photosensitive element 202 also generates the compensation offset of T' parallel to the second axial direction (Y direction), and the first axial direction (X direction) and the second axial direction (Y direction) are on the same plane.

Referring to FIG. 4, FIG. 4 is a schematic view of an optical focusing apparatus with shake compensation according to the present invention. As shown in fig. 4, when the prism group 102 moves along the second axial direction (Y direction), the incident light 201 incident to the first individual prism 102a generates an S 'compensation shift in a third axial direction (Z direction) substantially perpendicular to the second axial direction (Y direction), and the outgoing light 202 incident on the light sensing element 220 also generates an S' compensation shift parallel to the third axial direction (Z direction).

The above detailed description of the preferred embodiments is intended to more clearly describe the features and spirit of the present application and is not intended to limit the scope of the present application to the particular embodiments disclosed above. On the contrary, it is intended to cover various modifications and equivalent arrangements included within the scope of the claims of the present application.

Description of the symbols

10 device

101 protective casing

102 prism group

103 optical lens

104 lens holder

105 round ball group

106a to 106d magnets

107 round ball

108 prism carrier

109 round bar

110 movable carrying seat

111 a-111 b round bar

112 base

114 a-114 c coil

115 PCB

116 a-116 c position sensing assembly

117 a-117 c magnetic conductive disk

220 photosensitive element

102a first unitary prism

102b second single prism

201 incident light

202 emergent light

102a1, 102b1 light incident position

202a, 202b optical path

Claims

1. An optical focusing apparatus, comprising:

the lens assembly comprises an optical lens and a lens carrier seat for fixing the optical lens;

a photosensitive element;

the prism group comprises a plurality of single prisms, wherein the single prisms enable incident light to be changed in direction at least twice to form emergent light with the direction different from the incident direction of the incident light, the emergent light penetrates through the optical lens and is projected on the photosensitive element, and the first single prism which receives the incident light in the single prisms is defined as a first single prism; and

a prism assembly holder assembly for fixing the prism assembly and including a track device, so that the prism assembly can be driven by a driving force to move a predetermined distance in two coordinate axes by the track device, wherein the prism assembly is maintained on the same plane when moving in the two coordinate axes, wherein:

and adjusting the driving force according to a shake compensation signal to move the prism group by the preset distance, wherein when the prism group moves along a first coordinate axial direction, due to the first compensation movement of a travel direction changing point between the incident light and the prism group, the emergent light generates a second compensation movement on the photosensitive element along a second coordinate axial direction which is vertical to the first coordinate axial direction.

2. The optical focusing apparatus of claim 1, wherein the prism stack mount assembly and the prism stack are of a unitary structure or of a separate two-piece structure.

3. The optical focusing apparatus according to claim 1, wherein when the number of the single prisms is two, the single prisms include the first single prism and the second single prism, the first single prism and the second single prism are both substantially perpendicular to the outgoing light, and the incident light entering the first single prism and the outgoing light reflected by the second single prism are substantially perpendicular to each other, so that the incident light changes its traveling direction at least two times to become the outgoing light having a direction different from the incident direction of the incident light.

4. The optical focusing apparatus of claim 1, wherein:

when the prism group moves along the second coordinate axial direction, the emergent light generates a fourth compensation movement on the photosensitive element along a third coordinate axial direction which is vertical to the second coordinate axial direction due to a third compensation movement of a travel direction changing point between the incident light and the prism group; and

the prism group can move along the first coordinate axial direction and the second coordinate axial direction sequentially or synchronously.

5. The optical focusing apparatus of claim 1, wherein:

the driving force to move the prism assembly the predetermined distance is from a voice coil motor, memory alloy, or piezoelectric motor; and

the optical focusing device further comprises a base for mounting the lens assembly and the prism group carrier assembly, wherein the voice coil motor is composed of a plurality of magnetic conductive discs fixed on the base and a magnet fixed on the prism group carrier assembly, attractive force exists between the magnet and the magnetic conductive discs, the prism group carrier assembly is attracted and attached to the base, and the driving force is required to be greater than the attractive force to enable the prism group to move for the preset distance.

6. The optical focusing apparatus of claim 1, wherein:

the moving medium in the track device is a plurality of round rods, a plurality of round balls, or a single round rod matched with a single round ball or a plurality of round balls; and

the change in the traveling direction of the incident light occurs due to refraction.

7. An optical focusing apparatus, comprising:

an optical lens;

a photosensitive element; and

the optical compensation component group enables incident light to be changed in the traveling direction at least twice to form emergent light in the direction different from the incident direction of the incident light, wherein the emergent light penetrates through the optical lens and is projected on the photosensitive element, and when the optical compensation component group moves along the axial direction of a first coordinate, the emergent light generates second compensation movement on the photosensitive element along the axial direction parallel to the axial direction of a second coordinate vertical to the axial direction of the first coordinate due to the first compensation movement of the traveling direction changing point between the incident light and the optical compensation component group.

8. The optical focusing apparatus of claim 7, wherein:

the optical compensation component group is a prism group; and

9. A shake compensation method of an optical focusing apparatus including an optical lens, a photosensitive element, and an optical compensation component group that changes an incident light through at least two traveling directions into an exit light in a direction different from an incident direction of the incident light, wherein the exit light is projected on the photosensitive element through the optical lens, comprising the steps of:

providing a driving force to drive the optical compensation component group to move for a preset distance; and

and adjusting the driving force according to a shake compensation signal to move the optical compensation component group by the preset distance, wherein when the optical compensation component group moves along a first coordinate axial direction, the emergent light generates a second compensation movement on the photosensitive element along a second coordinate axial direction which is vertical to the first coordinate axial direction due to the first compensation movement of the traveling direction changing point between the incident light and the optical compensation component group.

10. The method of claim 9, wherein:

the optical compensation component group is a prism group; and