TWI567439B - Regulating mechanism for coaxiality of focusing lens - Google Patents

Description

Focusing lens group coaxial adjustment mechanism

The invention relates to a focusing mechanism group coaxial adjusting mechanism, in particular to a focusing mirror group coaxial adjusting mechanism for performing coaxial adjustment by adjusting an eccentricity of an adjusting ring.

Please refer to Fig. 1, which shows a conventional focusing mechanism. The focusing mechanism 10 includes a base 12, a focusing group frame 14, a spindle 16 and a focusing member 18. The main shaft 16 is a rod-shaped body and has a first end 162 and a second end 164. The first end 162 is inserted into a hole 122 of the base 12, and the second end 164 is limited by the focus member 18. The hole 182 is constrained, the focusing member 18 is locked on the base 12 by a bolt 5, the focusing group frame 14 has a hole 142, the main shaft 16 extends through the hole 142, and a motor (not shown) drives the focusing group frame 14 to move and The focus group frame 14 is moved along the main shaft 16 by the guidance and the limit of the main shaft 16.

In the above configuration, since the spindle 16 is restrained by the limiting hole 182 of the focusing member 18, the accuracy of the limiting hole 182 and the cumulative tolerance of assembly affect the coaxiality of the focusing group frame 14.

In view of the above, it is a primary object of the present invention to provide a focus group coaxial adjustment mechanism that adjusts the coaxiality of a focus group frame by adjusting the position of the spindle.

In order to achieve the above object, a focusing mirror group coaxial adjustment mechanism of the present invention The embodiment mainly includes a pedestal; a focusing member is disposed on the pedestal; a main shaft fixed to the pedestal and coupled to the focusing member; an adjusting ring rotatably disposed on the focusing member, the adjusting The ring has at least one hole, the main shaft is disposed through the hole, and a center of the hole is eccentrically disposed with a center of rotation of the adjusting ring; and a focusing group frame carries a focusing lens group, and the main shaft passes through the focusing Group the box and guide the focus group to move.

In the above embodiment, the adjusting ring has a hole, and the second end is disposed through the hole.

In the above embodiment, the outer circumference of the adjustment ring has at least one notch, and the focusing member has at least one protrusion, and the pair of protrusions are coupled to the notch.

In the above embodiment, the length of the notch along the outer circumference of the adjustment ring is greater than the length of the bump.

In the above embodiment, when the adjusting ring rotates, the adjusting ring is limited by the bump abutting on both sides of the notch.

In the above embodiment, the outer circumference of the adjusting ring forms a male thread portion, and the focusing member forms a female thread portion, and the adjusting thread is rotatably disposed on the male thread portion by being screwed to the female thread portion. The focusing member.

In the above embodiment, the outer circumference of the adjusting ring has at least one tooth, and the focusing member is provided with at least one slot, at least one of the teeth is movably disposed in the slot, and the adjusting ring is rotated by The teeth abut on both sides of the slot to limit the adjustment ring.

In the above embodiment, the width of the groove is greater than the width of the tooth.

In the above embodiment, the end surface of the adjustment ring forms a recess.

In the above embodiment, the recess has a circular arc surface.

In the above embodiment, the hole of the adjustment ring is a through hole.

The above and other objects, features, and advantages of the invention will be apparent from

5‧‧‧ bolt

10‧‧‧ Focusing mechanism

12‧‧‧ Pedestal

14‧‧‧ Focus group

16‧‧‧ Spindle

18‧‧‧Focus

20‧‧‧ Pedestal

30‧‧‧Focus

32‧‧‧Installation holes

34‧‧‧Bumps

35‧‧‧Bolts

36‧‧‧square slot

40‧‧‧ Spindle

42‧‧‧ first end

44‧‧‧ second end

50‧‧‧Adjustment ring

52‧‧‧ holes

54‧‧‧ gap

56‧‧‧ recess

58‧‧‧ teeth

60‧‧‧ Focus group frame

62‧‧‧ holes

100‧‧‧ Focusing mirror group coaxial adjustment mechanism

122‧‧‧ hole

142‧‧‧ hole

162‧‧‧ first end

164‧‧‧ second end

182‧‧‧Limited holes

C1‧‧ Center

C2‧‧‧ Rotation Center

Fig. 1 is a perspective view of a conventional focusing mirror group coaxial adjustment mechanism.

Fig. 2 is a perspective view showing an embodiment of a focusing mechanism group coaxial adjusting mechanism of the present invention.

Fig. 3 is an enlarged view of a portion A in Fig. 2.

Figure 4 is a perspective view of the adjustment ring of the present invention.

Fig. 5 shows an eccentric arrangement of the center of rotation of the adjustment ring of the present invention and the center of its hole.

Fig. 6 is a top plan view showing another embodiment of the focusing mechanism group coaxial adjusting mechanism of the present invention.

Figure 7 is a top plan view of another embodiment of the focusing mechanism group coaxial adjustment mechanism of the present invention.

Figure 8 is a top plan view of another embodiment of the focusing mechanism group coaxial adjustment mechanism of the present invention.

Please refer to Figures 2, 3 and 4, which show an embodiment of the focusing mechanism group coaxial adjustment mechanism of the present invention. The focusing mirror group coaxial adjusting mechanism 100 of the present invention comprises a base 20, a focusing member 30, a spindle 40, an adjusting ring 50, a focusing group frame 60, and a driving source (not shown). .

The focusing member 30 is fixed to the base 20 by a bolt 35. The focusing member 30 has a mounting hole 32. The adjusting ring 50 is fitted into the hole of the mounting hole 32 and can be rotated in the mounting hole 32. The adjusting ring 50 has a hole. 52. The main shaft 40 is a rod-shaped object and has a first end 42 and a second end 44. The first end 42 is fixed to the base 20, and the second end 44 is fitted into the hole 52 of the adjusting ring 50. . The focus group frame 60 carries a focus lens group (not shown) and has a hole 62 extending through the hole 62 by the spindle 40. When the focus group frame 60 is driven by a focus motor (not shown), the focus group frame 60 The guide 40 can be moved up and down along the main shaft 40.

For an optical lens, whether the optical axis of the focus lens group is accurately coaxial with the optical axis of other lens groups affects the optical performance of the optical lens as a whole, so that the coaxiality of the focus lens group can be adjusted by rotating the adjustment ring 50. . Referring to FIG. 5, the center C1 of the hole 52 of the adjusting ring 50 and the center of rotation C2 of the adjusting ring 50 are eccentrically disposed, so that when the adjusting ring 50 rotates around the center of rotation C2, the hole 52 also rotates around the center of rotation C2. The displacement is generated with respect to the center of rotation C2, so that the spindle 40 can be adjusted in position by the rotational displacement of the hole 52, and the optical axis of the focus lens group of the focus group frame 60 is adjusted to be associated with the optical axis of the other lens group. Achieve optimal coaxiality. In addition, adjusting the position of the main shaft 40 by rotating the adjustment ring 50 can also compensate for the accumulated tolerances of the assembly, and further improve the coaxiality.

Referring to FIGS. 3 and 4 again, three notches 54 are formed on the outer circumferential surface of the adjustment ring 50, and three projections 34 are formed on the edge of the attachment hole 32 on the focusing member 30, and the notches 54 are fitted to the projections. 34. The length of the notch 54 along the outer circumference of the adjusting ring 50 is greater than the length of the bump 34. When the adjusting ring 50 rotates, the adjusting ring 50 is restrained by the bump 34 abutting on both sides of the notch 54.

A concave portion 56 is formed on the end surface of the adjusting ring 50, and an adjusting tool is coupled to the concave portion 56 to push the adjusting ring 50 to rotate. The concave portion 56 has a circular arc surface for contacting the adjusting tool.

Please refer to Fig. 6, which shows another embodiment of the focusing mechanism group coaxial adjusting mechanism of the present invention. In the present embodiment, the adjusting ring 50 and the focusing member 30 are coupled in a threaded manner, that is, the outer circumferential surface of the adjusting ring 50 forms an external thread, and the focusing member 30 forms an internal thread by adjusting the external thread of the ring 50 and The internal threads of the focusing member 30 are screwed to each other to achieve the effect of rotating the adjustment ring 50.

Please refer to Fig. 7, which shows another embodiment of the focus mirror group coaxial adjustment mechanism of the present invention. In the present embodiment, the adjusting ring 50 forms a plurality of teeth 58 on its outer peripheral surface, and a plurality of square grooves 36 are formed on the focusing member 30. Since the width of the square groove 36 is larger than the teeth 58, the plurality of teeth 58 of the teeth 58 It is movably disposed in the slot 36, and the adjustment ring 50 is limited by the teeth 58 abutting on both sides of the slot 36 when the adjustment ring 50 rotates.

Please refer to Fig. 8, which shows another embodiment of the focusing mechanism group coaxial adjusting mechanism of the present invention. The configuration of this embodiment is substantially the same as that of the embodiment of Fig. 7, except that the adjusting ring 50 has only one tooth 58 formed on its outer peripheral surface, and correspondingly only one square groove 36 is formed on the focusing member 30. The teeth 58 are movably disposed in the slot 36. When the adjusting ring 50 rotates, the adjusting ring 50 is limited by the teeth 58 abutting on both sides of the slot 36.

The focus lens group of the focus group frame 60 of the present invention adjusts the position of the main shaft 40 by the adjustment ring 50 to maintain a high degree of coaxiality with other lens groups, thereby improving the overall performance of the optical lens, and also compensating for assembly. The accumulated tolerances further increase the coaxiality.

The present invention has been disclosed in the above embodiments, but it is not intended to limit the scope of the present invention. Any one skilled in the art can make some modifications and retouchings without departing from the spirit of the invention. The scope of protection is subject to the definition of the scope of the patent application attached.

20‧‧‧ Pedestal

30‧‧‧Focus

32‧‧‧Installation holes

34‧‧‧Bumps

35‧‧‧Bolts

40‧‧‧ Spindle

42‧‧‧ first end

44‧‧‧ second end

50‧‧‧Adjustment ring

52‧‧‧ holes

54‧‧‧ gap

56‧‧‧ recess

60‧‧‧ Focus group frame

62‧‧‧ holes

100‧‧‧ Focusing mirror group coaxial adjustment mechanism

Claims (10)

A focusing mirror group coaxial adjusting mechanism comprises: a base; a focusing member disposed on the base; a spindle fixed to the base and coupled to the focusing member; an adjusting ring rotatably disposed In the focusing member, the adjusting ring has at least one hole, the main shaft is disposed in the hole, and a center of the hole is eccentrically disposed with a center of rotation of the adjusting ring; and a focusing group frame carries a focusing lens group. The spindle passes through the focus group frame and guides the focus group frame to move. The focusing mirror group coaxial adjusting mechanism according to claim 1, wherein the outer circumference of the adjusting ring has at least one notch, and the focusing member has at least one protrusion, and the protruding block is coupled to the notch. The focus mirror group coaxial adjustment mechanism of claim 2, wherein the length of the notch along the outer circumference of the adjustment ring is greater than the length of the bump. The focusing mirror group coaxial adjusting mechanism of claim 3, wherein the adjusting ring is limited by the bump abutting on both sides of the notch when the adjusting ring rotates. The focusing mirror group coaxial adjusting mechanism according to claim 1, wherein an outer circumference of the adjusting ring forms a male thread portion, and the focusing member forms a female thread portion, and the male thread portion is screwed to the female thread The adjustment ring is rotatably disposed on the focusing member. The focus mirror group coaxial adjustment mechanism of claim 1, wherein the outer circumference of the adjustment ring has at least one tooth, the focus member is provided with at least one slot, and at least one of the teeth is movably disposed on In the slot, when the adjusting ring rotates, the adjusting ring is limited by the teeth abutting on both sides of the slot. The focusing mirror group coaxial adjusting mechanism according to claim 6, wherein the groove has a width larger than a width of the tooth. The focusing mirror group coaxial adjusting mechanism according to claim 1, wherein the hole is a through hole. The focusing mirror group coaxial adjusting mechanism according to any one of claims 1 to 8, wherein an end surface of the adjusting ring forms a concave portion. The focusing mirror group coaxial adjusting mechanism according to claim 9, wherein the concave portion has a circular arc surface.