JP2009103950A - Lens barrel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly accurately and easily assemble a plurality of lenses each having a different outer diameter in a lens barrel. <P>SOLUTION: A lens 15 which has a diameter smaller than the inner diameter of a lens barrel body 11 and which cannot be inserted into the lens barrel body 11 without a gap is inserted into one collar 17 or a plurality of collars 17 arranged in a nesting shape, so that the lens 15 and the collars 17 have such a diameter that all of the lens 15 and the collars 17 can be inserted into the lens barrel body 11 without the gap, to be arranged in the lens barrel body 11. Each lens 15, each collar 17 and a diaphragm 18 in the lens barrel mein body 11 are positioned by the thickness and the shape of spacer rings 16 arranged between them. Each lens 15, each collar 17, each spacer ring 16 and the diaphragm 18 are fixed in the lens barrel body 11 by holding all of respective lenses 15, collars 17, spacer rings 16 and the diaphragm 18 by a bottom cover 12 and a projection side cover 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lens barrel that houses a plurality of lenses having different diameters.

As a technique relating to the manufacturing of the lens barrel, as schematically shown in a cross section of the lens barrel in FIG. 3A, the inner surface of the lens barrel 100 is formed such that a radial step 101 is formed, In addition, a technique for assembling the lens of the lens barrel by sandwiching the outer peripheral portion of the lens 120 from both sides between the holding ring 110 arranged in the lens barrel 100 is known (for example, Patent Document 1). Note that a male screw threadedly engaged with a female screw provided on the inner side surface of the lens barrel is provided on the outer side surface of the retaining ring 110, and the retaining ring 110 is fixed inside the lens barrel 100 using the male screw. Is done.
JP-A-6-18797

  According to the structure for assembling the lens of the lens barrel shown in FIG. 3a, when assembling a plurality of lenses having different diameters to the lens barrel, as shown in FIG. Therefore, the shape of the inner surface of the lens barrel 100 becomes complicated.

For this reason, it is difficult to manufacture the lens barrel with high accuracy, and it is difficult to assemble the lens to the lens barrel.
Accordingly, an object of the present invention is to enable easy and accurate assembly of a plurality of lenses having different outer diameters to a lens barrel.

  To achieve the above object, the present invention provides a lens barrel containing a plurality of lenses, a hollow cylindrical barrel body, a hollow cylindrical collar inserted into a hollow portion of the barrel main body, At least one lens inserted into the hollow portion of the collar, the lens and the collar inserted into the barrel main body or the collar, and abuts in the optical axis direction of the lens barrel; And an annular spacer ring for positioning the position of the collar in the optical axis direction.

  Here, such a lens barrel may be configured such that a plurality of the collars having different hollow portion diameters are provided, and lenses having different diameters are inserted into the plurality of collars. Further, the lens inserted in the hollow portion of the barrel main body without the collar interposed may be provided.

  According to the lens barrel as described above, the difference in the diameter of the lens can be absorbed by inserting the lens into the collar. Therefore, the lens barrel is different by using a hollow cylindrical barrel body having a uniform inner diameter. A lens barrel that accommodates a lens of a diameter can be created. Also, the spacer ring for positioning the collar and lens, and the collar can also be a member having a simple shape such as a substantially circular or hollow cylindrical shape. As a result, the lens can be assembled to the lens barrel body with high accuracy.

  Further, the lens can be assembled to the lens barrel by a simple operation of simply inserting the spacer ring, the collar, and the lens into the lens barrel body in a predetermined order.

  As described above, according to the present invention, it is possible to easily and accurately assemble a plurality of lenses having different outer diameters to a lens barrel.

Embodiments of the present invention will be described below.
The lens barrel according to the present embodiment incorporates a lens group composed of a plurality of lenses and a light emitting diode, condenses the light generated by the light emitting diode by the lens group, and is provided at one end of the lens barrel. More injecting.
Here, FIG. 1a shows the appearance of the lens barrel 1 according to this embodiment with the light emission opening 2 at the bottom, and FIG. 1b shows the light emission opening 2 of the lens barrel 1 according to this embodiment with the top. Appearance is shown. FIG. 1 c schematically shows a cross section of the lens barrel 1.
As shown in the figure, the lens barrel 1 includes a hollow cylindrical body 11, an annular bottom lid 12, a projection side lid 13 provided with the above-described light emission opening 2, a diode base 14, a plurality of lenses 15, A plurality of spacer rings 16 having an annular shape, a plurality of collars 17 having a hollow cylindrical shape, and a diaphragm 18 are provided.

The bottom cover 12 is fixed to the lens barrel body 11 by screwing a male screw provided on the peripheral surface of the bottom cover 12 with a female screw provided on the inner peripheral surface of one end of the lens barrel body 11. ing. In addition, the projection-side lid 13 is fixed to the other end side of the barrel main body 11 with a screw 31.
Next, a light emitting diode 42 is mounted on the diode substrate 14 and a power supply line 43 for the light emitting diode is connected thereto. Further, the diode base 14 is fixed to the bottom cover 12 side of the spacer ring 16 closest to the bottom cover 12 with screws 41 so as to close the central hole of the spacer ring 16. Further, the spacer ring 16 on the most bottom cover 12 side is fixed to the inside of the lens barrel body 11 by the spacer ring 16 and the diode base 14 so as to close the central hole of the bottom cover 12 from the inside of the lens barrel. Yes. In this state, a part of the diode base 14 is located in the central hole of the bottom cover 12, the light emitting diode 42 mounted on the diode base 14 is disposed inside the lens barrel body 11, and the feed line 43 is connected to the lens. It is exposed to the outside of the lens barrel 1.

Next, some of the collars 17 among the plurality of collars 17 have an inner diameter of the hollow portion of the barrel main body 11 so that the collar 17 can be inserted into the hollow portion of the barrel main body 11 without gaps or rattling. It has a slightly smaller outer diameter and is fixed in a form inserted into the hollow portion of the barrel body 11. The remaining collars 17 of the plurality of collars 17 are fixed in a state of being inserted into the hollow portions of the other collars 17, and there are no gaps, rattling, or the like in the hollow portions of the other collars 17. It has an outer diameter slightly smaller than the inner diameter of the hollow portion of the other collar 17 so that it can be inserted.
Further, a lens 15 is inserted into a hollow portion of each collar 17 in which no other collar 17 is inserted into the hollow portion, and the inner diameter of the hollow portion of each collar 17 into which the lens 15 is inserted is The lens 15 is slightly larger than the outer diameter of the lens 15 so that the lens 15 can be inserted into the hollow portion of the collar 17 without gaps or rattling. The lens 15 having a diameter smaller than the inner diameter of the lens barrel main body 11 that cannot be inserted into the lens barrel main body 11 without a gap is inserted into one collar 17 or a plurality of collars 17 arranged in a nested manner. The entire lens 15 and the collar 17 into which the lens 15 is inserted are configured to have a diameter that can be inserted into the lens barrel body 11 without a gap.

Next, the lenses 15, the collars 17, and the diaphragm 18 inside the barrel main body 11 are positioned by the thickness and shape of the spacer ring 16 disposed therebetween.
The lens 15, the collar 17, the spacer ring 16, and the diaphragm 18 are fixed inside the lens barrel body 11 by fixing the lens 15, the collar 17, the spacer ring 16, and the diaphragm 18 as a whole. 12 and the projection-side lid 13.
As described above, according to the lens barrel 1 according to the present embodiment, the lens body 11 is fixed to a desired position while the lens 15 having a different inner diameter is formed in a hollow cylindrical shape having a uniform inner diameter. Can do. In addition, since the spacer ring 16 and the collar 17 can also be members having a simple shape such as a substantially circular or hollow cylindrical shape, the lens barrel body 11, the spacer ring 16 and the collar 17 can be manufactured with high accuracy. Thus, the lens 15 can be assembled to the lens barrel body 11 with high accuracy.

  In addition, according to the lens barrel 1 according to the present embodiment, the lens 15 is assembled to the lens barrel 1 as shown in FIG. 1d, with the spacer ring 16, the collar 17, the lens 15, The diaphragm 18 is inserted in a predetermined order, and the bottom lid 12 and the projection side lid 13 can be simply fixed to the barrel main body 11.

Here, FIG. 2 shows a usage example of such a lens barrel 1. FIG. 2 shows an example of use of the lens barrel 1 when the inspection of the light emitting diodes 42 accommodated in the lens barrel 1 is applied to an inspection apparatus.
In the illustrated example, the lens barrel 1 is connected and fixed to a hollow cylindrical holder 21. In this state, when the light-emitting diode 42 inside the lens barrel 1 is fed from the feeder line 43 to cause the light-emitting diode 42 inside the lens barrel 1 to emit light, the light generated by the light-emitting diode 42 is The light is condensed while passing through each lens 15 and the diaphragm 18 inside the lens barrel 1, and is emitted from the light emission opening 2 of the projection side lid 13 of the lens barrel 1 to the inside of the holder 21.

  The light emitted into the holder 21 is incident on the light receiving system 22 of the measuring apparatus connected to the other end of the holder 21, passes through the projection lens 221 and the optical filter 222, and is a two-dimensional image sensor such as a CCD. An image representing the light distribution of the light emitting surface of the light emitting diode 42 is formed on 223. Then, the measuring device detects the light distribution on the light emitting surface of the light emitting diode 42 from the image obtained by capturing the image with the two-dimensional image sensor 223, and performs a predetermined analysis or the like.

  The embodiment of the present invention has been described above.

It is a figure which shows the lens barrel which concerns on embodiment of this invention. It is a figure which shows the usage condition of the lens-barrel which concerns on embodiment of this invention. It is a figure which shows the structure of the conventional lens barrel.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Lens barrel, 2 ... Light emission opening, 11 ... Lens barrel main body, 12 ... Bottom lid, 13 ... Projection side lid, 14 ... Diode base, 15 ... Lens, 16 ... Spacer ring, 17 ... Color, 18 ... Diaphragm, 21 ... Holder, 22 ... Light receiving system, 42 ... Light emitting diode, 43 ... Feed line, 221 ... Projection lens, 222 ... Optical filter, 223 ... Two-dimensional image sensor.

Claims (3)

A lens barrel containing a plurality of lenses,
A hollow cylindrical barrel body;
A hollow cylindrical collar inserted into the hollow portion of the lens barrel body;
At least one lens inserted into the hollow portion of the collar;
The lens and the collar, which are inserted into the lens barrel body or the collar, abut on the optical axis direction of the lens barrel, and position the lens and the color in the optical axis direction. A lens barrel having a spacer ring.
The lens barrel according to claim 1,
A plurality of the collars having different diameters of the hollow portions;
A lens barrel in which lenses having different diameters are inserted into the plurality of collars.
The lens barrel according to claim 1 or 2,
A lens barrel having the lens inserted in the hollow portion of the barrel main body without the collar interposed therebetween.