Prism device applied to periscope lens module and periscope lens module

Patent metadata

Field	Value
Publication number	US-2020379239-A1
Application number	US-202016945940-A
Country	US
Kind code	A1
Filing date	Aug 3, 2020
Priority date	Jun 1, 2019
Publication date	Dec 3, 2020
Grant date	—

Abstract

Provided is a prism device applied to a periscope lens module. The prism device includes: a bearing frame; a supporting-restoring assembly; a prism; and shape memory alloy wires. The bearing frame includes a horizontal support plate, a vertical support plate, and two side plates. The shape memory alloy wires are connected to the supporting-restoring assembly and the bearing frame from the two side plates, respectively, so as to drive the supporting-restoring assembly to drive the prism to rotate about a first rotation center axis, and are connected to the supporting-restoring assembly and the bearing frame from the horizontal support plate and the vertical support plate, respectively, so as to drive the supporting-restoring assembly to drive the drive the prism to rotate about a second rotation center axis. The present invention replaces the electromagnetic driving with the shape memory alloy wire, thereby reducing a manufacturing cost.

First claim

What is claimed is:

1 . A prism device applied to a periscope lens module, the prism device comprising:
a bearing frame; a supporting-restoring assembly rotatably mounted to the bearing frame; a prism mounted to the supporting-restoring assembly and rotatable with the supporting-restoring assembly; and a plurality of shape memory alloy wires connected between the bearing frame and the supporting-restoring assembly and configured to drive the supporting-restoring assembly and the prism to rotate relative to the bearing frame, wherein the bearing frame comprises a horizontal support plate, a vertical support plate, and two side plates; the vertical support plate extends from an end of the horizontal support plate while being bent upwards, and each of the two side plates is provided between one side edge of the horizontal support plate and one side edge of the vertical support plate that are opposite to each other; the horizontal support plate, the vertical support plate, and the two side plates define a cavity; the plurality of shape memory alloy wires comprises a first shape memory alloy wire, a second shape memory alloy wire, a third shape memory alloy wire, and a fourth shape memory alloy wire; the first shape memory alloy wire and the second shape memory alloy wire are connected to the supporting-restoring assembly and the bearing frame from the two side plates, respectively, so as to drive the supporting-restoring assembly to drive the prism to rotate about a first rotation center axis; the third shape memory alloy wire and the fourth shape memory alloy wire are connected to the supporting-restoring assembly and the bearing frame from the horizontal support plate and the vertical support plate, respectively, so as to drive the supporting-restoring assembly to drive the prism to rotate about a second rotation center axis; and the first rotation center axis perpendicularly intersects the second rotation center axis.

2 . The prism device applied to the periscope lens module as described in claim 1 , wherein each of the plurality of shape memory alloy wires comprises two ends fixed to the supporting-restoring assembly and a middle portion hooked to the bearing frame, in such a manner that the shape memory alloy wire is formed into a “V” shape.

3 . The prism device applied to the periscope lens module as described in claim 2 , wherein the bearing frame further comprises two first locating rods respectively protruding from the two side plates and provided in the cavity, a second locating rod protruding from the horizontal support plate and provided in the cavity, and a third locating rod protruding from the vertical support plate and provided in the cavity; and the middle portion of the first shape memory alloy wire is hooked to one of the two first locating rods, the middle portion of the second shape memory alloy wire is hooked to the other one of the two first locating rods, the middle portion of the third shape memory alloy wire is hooked to the second locating rod, and the middle portion of the fourth shape memory alloy wire is hooked to the third locating rod.

4 . The prism device applied to the periscope lens module as described in claim 3 , wherein the two first locating rods, the second locating rod, and the third locating rod are each a stepped rod comprising a first rod body, a second rod body and a third rod body; the first rod body is connected to the bearing frame, and the second rod body is arranged between the first rod body and the third rod body; each of the first rod body and the third rod body has a larger outer diameter than the second rod body; and the middle portion of each of the plurality of shape memory alloy wires is hooked to the second rod body of a corresponding stepped rod.

5 . The prism device applied to the periscope lens module as described in claim 3 , wherein the bearing frame further comprises a protrusion provided in the cavity, and the supporting-restoring assembly is rotatably connected to the protrusion; and the first shape memory alloy wire, the second shape memory alloy wire, the third shape memory alloy wire and the fourth shape memory alloy wire are spaced apart from each other and distributed around the protrusion.

6 . The prism device applied to the periscope lens module as described in claim 5 , further comprising a ball, wherein the supporting-restoring assembly is rotatably connected to the protrusion through the ball; a top of the protrusion comprises an inclined surface inclined relative to both the horizontal support plate and the vertical support plate, and the inclined surface is provided with a locating groove for receiving and locating the ball; and a spherical arc recess for matching the ball is provided at a side of the supporting-restoring assembly facing towards the bearing frame.

7 . The prism device applied to the periscope lens module as described in claim 6 , further comprising a magnet, wherein the protrusion is provided with a mounting groove located between the locating groove and a bottom of the protrusion, and the magnet is received and located in the mounting groove for attracting and locating the ball and the supporting-restoring assembly.

8 . The prism device applied to the periscope lens module as described in claim 1 , wherein the supporting-restoring assembly comprises a shape memory alloy wire-supporting frame rotatably connected to the bearing frame, and an elastic support member arranged between the shape memory alloy wire-supporting frame and the prism and elastically connected to the bearing frame; the prism is mounted to the elastic support member; and each of the first shape memory alloy wire, the second shape memory alloy wire, the third shape memory alloy wire, and the fourth shape memory alloy wire is connected between the bearing frame and the shape memory alloy wire-supporting frame.

9 . The prism device applied to the periscope lens module as described in claim 8 , wherein the elastic support member comprises an elastic bracket elastically connected to the bearing frame, a holder provided between the elastic bracket and the shape memory alloy wire-supporting frame, and a prism support provided at a side of the elastic bracket facing away from the holder; and the prism is mounted to the prism support; and/or
the shape memory alloy wire-supporting frame comprises two first side edges that are spaced apart from each other, and two second side edges that are spaced apart from and opposite to each other and are vertically connected to the two first side edges; the first shape memory alloy wire is connected between one of the two first side edges and one of the two side plates, the second shape memory alloy wire is connected between the other one of the two first side edges and the other one of the two side plates, the third shape memory alloy wire is connected between one of the two second side edges and the horizontal support plate, and the fourth shape memory alloy wire is connected between the other one of the two second side edges and the vertical support plate.

10 . A periscope lens module, comprising a shell frame, a lens device mounted to a middle portion of the shell frame, an image sensor mounted to one end of the shell frame and located at an image side of the lens device, and a prism device applied to the periscope lens module, wherein the prism device applied to the periscope lens module is mounted to another end of the shell frame and is located at an object side of the lens device,
wherein the prism device comprises: a bearing frame; a supporting-restoring assembly rotatably mounted to the bearing frame; a prism mounted to the supporting-restoring assembly and rotatable with the supporting-restoring assembly; and

Assignees

• Aac Optics Solutions Pte Ltd

Inventors

• Li Linzhen
• Lu Jiliang
• Li Gang
• Zhang Jin

Classifications

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• G02B27/646

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · CPC title

• G02B23/08 Primary

  Periscopes {(arrangements on floating structures of underwater viewing devices B63C11/49; arrangement of visual watch equipment on submarines B63G8/38)} · CPC title

• G02B7/1805 Primary

  for prisms (G02B7/181 takes precedence) · CPC title

• G03B5/00

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title