JP3096870B2 - Angle measurement method of optical fiber insertion hole of multi-core ferrule - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring an angle of an optical fiber insertion hole, which is one of important quality control items of a multi-core ferrule used for communication or measurement.

[0002]

2. Description of the Related Art Regarding a method for measuring the angle of an optical fiber insertion hole of a single-core ferrule, the following method has already been used in JI.
It is S. The angle of the optical fiber insertion hole is represented by the angle θ between the central axis 12 of the single core ferrule 10 and the insertion hole 14, as shown in FIG.

[0003] This θ is measured as follows. That is, as shown in FIG. 6, from the end face of the single core ferrule 10,
A plug gauge 16 (including an optical fiber which may be used instead) having an outer diameter substantially equal to the diameter of the optical fiber insertion hole 14 is protruded (length L), and a V block 18 (or an inelastic cylindrical precision sleeve) is protruded. ) On single core ferrule 1
0, and the displacement a of the tip of the plug gauge 16 is calculated as
The measurement is performed using the microscope 20 and the TV monitor 22.

(Equation 1)

[0004]

When the above method is applied to the measurement of the angle of the optical fiber insertion hole of the multi-core ferrule, the following will occur. That is, as shown in FIG. 7, the jig 26 is mounted on the rotary table 24 so as to be movable in the xy directions, and the multi-core ferrule 30 is fixed thereon. The jig 26 is adjusted for each optical fiber insertion hole 34 so that they coincide with the central axis 28 of rotation, and the above measurement is performed. Therefore, it takes time.

It is also possible to polish a fixed amount of the ferrule end face, measure the position of the center of the optical fiber insertion hole, and measure the angle from the deviation from the initial value. However, there is a problem that if the cut amount is small, there is no accuracy, and if the cut amount is large, product inspection cannot be performed.

[0006]

Means for Solving the Problems As shown in FIGS. 1 and 2,
(1) A pair of multi-core ferrules 30 are fitted using fitting pins 36, and (2) a plug gauge 16 having an outer diameter substantially equal to the optical fiber insertion hole diameter from the ferrule end face (light which may be used instead). (Including fiber)
(3) The angle of the optical fiber insertion hole of the multi-core ferrule is measured by optically measuring the position of the protruding tip of the plug gauge 16 based on the position of the fitting pin 36 as a reference.

[0007]

[Operation] In FIG. 3, reference numeral 160 denotes a plug gauge when the angle deviation θ of the optical fiber insertion hole is assumed to be zero. Assuming that the plug gauge 160 is located nth from the upper fitting pin 36 in the figure, the position of the tip A (coordinates in space) is determined based on the fitting pin 36. This sample is placed on a stage provided with optical measuring means such as a microscope 38 capable of reading in the Y and Z directions,
The actual position coordinates of the tip B of the n-th plug gauge 16 are measured. Assuming that the amount of protrusion of the plug gauge 16 from the ferrule end face is L and the deviation from A is Δy, Δz, the angle deviation θ of the optical fiber insertion hole is

(Equation 2)

[0008]

1 and 2 are explanatory views showing an embodiment of the present invention. Each optical fiber insertion hole 3 of the multi-core ferrule 30
As in the conventional case, a plug gauge 16 (including a straight optical fiber) having an outer diameter substantially equal to that of the plug gauge 4 is inserted into the plug 4 and projected from the end face. A pair of multi-core ferrules 30
Are fitted by fitting pins 36. The gap between the tips of the plug gauges 16 is slightly opened. As the optical measuring means, a microscope 38 capable of reading in the Y and Z directions is used. Reference numeral 40 denotes a dial gauge for detecting the displacement of the microscope 38 in the z direction.

As for the reference in the Z direction, if the connection is made in the reverse direction and the measurement is performed with the tip position of one plug gauge 16 as the reference, the measurement accuracy is improved. The reverse connection means that one of the multi-core ferrules 30 is pulled out from the fitting pin 36, turned upside down, and inserted into the fitting pin 36. That is, as shown in FIG.
The coordinates of the tip C of No. 6 are set to zero, and the plug gauge 16 of # 2 is set.
The Z coordinate of the tip D of is measured. Assuming that the value is Δz1 in the reverse tangent as shown in FIG. 9A and Δz2 in the tangent as shown in FIG. 7B, the deviation of the tip C of the plug gauge 16 of # 1 from the specified value is

(Equation 3)

[0010]

According to the present invention, a pair of ferrules is fitted using a fitting pin, and a plug gauge having an outer diameter substantially equal to the diameter of the optical fiber insertion hole is projected from the end face of the ferrule, and the position of the fitting pin is referenced. Since the position of the protruding tip of the plug gauge is optically measured, the following effects are obtained. (1) The measurement can be performed easily and in a short time because the measurement can be performed with the sample fixed (without rotating as in the related art). (2) By increasing the amount of projection of the plug gauge from the end face of the ferrule, the optical fiber insertion hole can be measured with high accuracy. (3) Since it is a non-destructive measurement, a ferrule having a small optical fiber insertion hole can be selected and used as a lot or as a single item.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a state in which the present invention is implemented.

FIG. 2 is an explanatory view showing a state in which a pair of ferrules are fitted using fitting pins and a plug gauge is projected from an end face of the ferrule in implementing the present invention.

FIG. 3 is an explanatory diagram of the operation of the present invention.

FIG. 4 is an explanatory diagram in a case where measurement is performed by connecting the reference in the Z direction in the present invention in a normal / reverse connection.

FIG. 5 is an explanatory diagram of an angle of an optical fiber insertion hole in a single-core ferrule.

FIG. 6 is an explanatory diagram of a method for measuring the angle of an optical fiber insertion hole in a single-core ferrule.

FIG. 7 is an explanatory diagram in a case where a method for measuring the angle of an optical fiber insertion hole in a single-core ferrule is applied to a multi-core ferrule.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Single core ferrule 12 Center axis 14, 34 Optical fiber insertion hole 16 Plug gauge 18 V block 20, 38 Microscope 22 TV monitor 24 Rotary table 26 Jig 30 Multi-core ferrule 32 Fitting hole 36 Fitting pin

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01B 11/00-11/30 102 G01B 21/00-21/32 G01B 5/00-5/30 G02B 6 / 00 G02B 6/24 G02B 6/36-6/40

Claims (1)

(57) [Claims] In a method for measuring an angle of an optical fiber insertion hole of a multi-core ferrule of a guide pin fitting method, a pair of ferrules are fitted using a fitting pin, and an optical fiber insertion hole diameter is determined from an end face of the ferrule. An angle measuring method for an optical fiber insertion hole of a multi-core ferrule, in which a plug gauge having substantially the same outer diameter is projected, and the position of the projected plug gauge tip is optically measured based on the position of the fitting pin. .