TWI451149B - Lens group - Google Patents

Description

Lens group

The present invention relates to an optical mechanism, and more particularly to a lens assembly.

Referring to FIG. 1 , a conventional lens assembly includes a fixed cylinder 70 , a zoom cylinder 75 , a lens barrel 80 , three rollers 85 , and three bolts 90 . The fixed cylinder 70 has a long groove equidistantly distributed. The zoom cylinder 75 is sleeved on the fixed cylinder 70, and the zoom cylinder 75 has three cam grooves 76 respectively communicating with the long slots 71; the lens barrel 80 is provided with a lens group 95, The lens barrel 80 is disposed in the fixed cylinder 70, and the lens barrel 80 has three screw holes 81 respectively communicating with the long slots 71; the rollers 85 are respectively sleeved on the bolts 90; The bolt 90 is screwed into the screw hole 81 through the corresponding cam groove 76 and the long groove 71.

Therefore, referring to FIG. 2, the bolts 90 can be moved along the cam grooves 76 through the respective zoom rollers 75, thereby driving the lens barrel 80 to the optical axis of the lens group 95. The center rotates to reciprocate the lens barrel 80 in the optical axis direction of the lens group 95, thereby achieving the purpose of zooming.

However, the above-described lens group structure design is not only time-consuming in assembly, but also causes the bolts 90 to loosen when the rollers 85 rotate, which may cause the lens group to easily loosen the components. Therefore, from the above description, it can be known that the conventional lens group design is still not perfect, and there is still room for improvement.

In view of this, the main object of the present invention is to provide a lens assembly which is simple in structure and quick in assembly.

In order to achieve the above object, the lens set provided by the present invention comprises a fixed cylinder, a lens barrel and a limiting member. Wherein, the inner cylinder wall of the fixing cylinder has at least one cam groove, and one end of the cam groove has an opening formed on the fixing cylinder; the lens barrel is disposed in the fixing cylinder in a manner rotatable in the fixing cylinder, And a lens group is disposed therein; the outer cylinder wall has at least one convex shaft and a groove; the convex shaft is located in the cam groove through the opening; thereby, the lens barrel rotates in the fixed cylinder The protruding shaft is movable along the cam groove; the limiting member is disposed on the fixing cylinder, and a portion thereof is located in the groove of the lens barrel.

Thereby, when the lens barrel rotates in the fixing cylinder, the limiting member is restrained by the groove wall of the groove to limit the rotation angle of the lens barrel, and the lens assembly can be assembled quickly by using the above design, and It is not easy to produce looseness.

In order that the present invention may be more clearly described, the preferred embodiments are illustrated in the accompanying drawings.

Referring to FIG. 3, the lens assembly 1 of the present invention comprises a fixed cylinder 10, a lens barrel 20 and a limiting member 30. Wherein: the cylinder wall of the fixed cylinder 10 has three equally spaced cam grooves 12, and each of the cam grooves 12 is a groove extending through the wall of the fixed cylinder 12. In addition, referring to FIG. 4, one end of each of the cam grooves 12 defines an opening 121 on the fixed cylinder 10. Furthermore, the fixed cylinder 10 has a screw hole 14 extending through the wall of the cylinder.

The lens barrel 20 is disposed in the fixed cylinder 10 so as to be rotatable in the fixed cylinder 10, and a lens group 40 is disposed inside the lens barrel 20. The lens barrel 20 has three equidistantly distributed convex shafts 22 on the outer cylinder wall. Each of the convex shafts 22 is located in each of the cam grooves 12 through the corresponding opening 121, and the lens barrel 20 is in the fixed cylinder 10 When the middle rotates, the convex shafts 22 can be driven to move along the cam grooves 12 at the same time. In addition, the outer cylinder wall of the lens barrel 20 has a groove 24 disposed along the circumference of the outer cylinder wall of the lens barrel 20 with respect to the screw hole 14 , and the groove 24 communicates with the screw hole 14 .

The restraining member 30 is a bolt and has a connecting body 32 and a head 34. One end of the body 32 passes through the screw hole 14 and is located in the groove 24 of the lens barrel 20. The head portion 34 is pressed against the region of the fixed cylinder 10 around the screw hole 14.

Therefore, the above-mentioned design can not only achieve the effect of rapid assembly, but when the lens barrel 20 rotates in the fixed cylinder 10, the restricting member 30 is restrained by the groove wall of the groove 24 to restrict the rotation of the lens barrel 10. angle. Referring to FIG. 5 and FIG. 6 , when the lens barrel 20 rotates in the fixed cylinder 10 , the body portion 32 of the limiting member 30 will abut the end of the groove 24 of the lens barrel 20 , and the lens barrel 20 is brought into contact with the lens barrel 20 . Will be restricted to stop at a first position. Referring to FIG. 5, when the lens barrel 20 is reversely rotated in the fixed cylinder 10 by a predetermined distance until the convex shaft 22 is in contact with the other end of the cam grooves 12, the lens barrel 20 will be restricted. Stop at a second position. In this way, the lens barrel 20 can be moved between the first position and the second position along the optical axis of the lens group 40.

In addition, the restricting member 30 does not rotate when the lens barrel 20 rotates, which can greatly reduce the probability of loosening of the restricting member 30, thereby achieving the purpose of improving the reliability of the lens group 1.

Furthermore, the number of components required for the lens assembly 1 of the present invention is also smaller than that of the conventional lens group, and when the lens group is mass-produced, the effect of greatly reducing the material cost can be achieved.

It should be noted that, in addition to using the above-mentioned convex shaft 22 and the other end of the cam groove 12 to restrict the rotation angle of the lens barrel 20, the lens barrel 20 is located outside the second position, and may also be The lens unit 2 shown in Figs. 8 and 9 is such that the body portion 62 of the restricting member 60 and the other end of the groove 54 of the lens barrel 50 are brought into contact with each other, so that the lens barrel 50 is restricted to the second position.

In addition, the cam groove of the fixing cylinder of the present invention is not limited to the groove extending through the wall of the fixing cylinder, and may be a groove provided only on the inner wall surface of the fixing cylinder, and the number of the cam grooves is not limited thereto. Three, can also be changed to one, two or four or more according to the needs. The number and shape of the convex axes of the lens barrel may be changed according to the number and type of the corresponding cam grooves in addition to the above structure.

Furthermore, the limiting member of the present invention is not limited to the bolt, and is a further feasible embodiment of the present invention as long as it can restrict the structure in which the lens barrel rotates within a certain range without being separated from the fixed cylinder. Variations in the equivalent structure and manufacturing method of the present invention and the scope of the patent application are intended to be included in the scope of the present invention.

1. . . Lens group

10. . . Fixed cylinder

12. . . Cam groove

121. . . Opening

14. . . Screw hole

20. . . Lens barrel

twenty two. . . Convex axis

twenty four. . . Trench

30. . . Restriction

32. . . Body

34. . . head

40. . . Lens group

2. . . Lens group

50. . . Lens barrel

54. . . Trench

60. . . Restriction

62. . . Body

70. . . Fixed cylinder

71. . . Long slot

75. . . Variable cylinder

76. . . Cam groove

80. . . Lens barrel

81. . . Screw hole

85. . . Wheel

90. . . bolt

95. . . Lens group

Figure 1 is an exploded view of a conventional lens assembly.

2 is a perspective view of a conventional lens group.

Figure 3 is an exploded view of the first embodiment of the present invention.

Figure 4 is a perspective view of the fixed cylinder.

Fig. 5 is a plan view showing the lens barrel of the first embodiment in a first position.

Figure 6 is a front elevational view of the lens barrel of the first embodiment in a first position.

Fig. 7 is a plan view showing the lens barrel of the first embodiment in a second position.

Figure 8 is a plan view showing the lens barrel of the second embodiment in a second position.

Figure 9 is a front elevational view of the second embodiment of the lens barrel in the second position.

1. . . Lens group

10. . . Fixed cylinder

12. . . Cam groove

14. . . Screw hole

20. . . Lens barrel

twenty two. . . Convex axis

twenty four. . . Trench

30. . . Restriction

32. . . Body

34. . . head

40. . . Lens group

Claims (6)

A lens assembly comprising: a fixed cylinder having at least one cam groove on an inner cylinder wall, and one end of the cam groove is formed with an opening on the fixed cylinder; and a lens barrel is rotatable in the fixed cylinder Provided in the fixed cylinder, and having a lens group inside thereof; the outer cylinder wall has at least one convex shaft and a groove; the convex shaft is located in the cam groove through the opening; thereby, the mirror When the cylinder rotates in the fixed cylinder, the protruding shaft can be moved along the cam groove; and a limiting member is disposed on the fixing cylinder, and a portion thereof is located in the groove of the lens barrel, thereby When the lens barrel rotates in the fixed cylinder, the restricting member is restrained by the groove wall of the groove to limit the angle of rotation of the lens barrel. The lens unit of claim 1, wherein the limiting member is resisted by the groove wall of the groove to limit the rotation angle of the lens barrel when the lens barrel is rotated in the fixed cylinder, so that the lens barrel can be When the first position is moved between the first position and the second position, and the lens barrel is in the first position, the limiting member is in contact with the groove wall at one end of the groove of the lens barrel. The lens assembly of claim 2, wherein the restricting member is in contact with the other end of the groove of the lens barrel when the lens barrel is in the second position. The lens assembly of claim 2, wherein the convex axis of the lens barrel is in contact with the other end of the cam groove when the lens barrel is in the second position. The lens unit of claim 1, wherein the cam groove is a groove extending through the wall of the fixed cylinder. The lens unit of claim 1, wherein the fixing cylinder has a screw hole; the limiting member is a bolt, and the bolt has a body and a head; the body is located in the screw hole and is located The groove of the lens barrel; the head is pressed against the area of the fixing cylinder around the screw hole.