JPH07100287B2 - Finished lens determination device for ball mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention determines whether or not a raw lens can be ground into the shape of the lens frame in order to frame the lens in the lens frame of the spectacle frame. The present invention relates to a raw lens determination device for a ball-sliding machine.

(Prior Art) In Japanese Patent Application No. 60-115079, the present applicant has proposed that the lens frame of the spectacle frame is directly or the template having the same shape as the lens frame is used as the radial information (ρ _i , θ _i ) [i = 1,2,3, ... N], and proposed a ball slicing machine that processes unprocessed lenses based on the radial information.

The device has lens measuring means for measuring the radius of the raw lens. Moreover, this device compares the lens radius Ri measured by this measuring means with the radius vector ρ _{i of the} lens frame, and if there is a portion where R _i <ρ _i , the shape of the lens frame from the unprocessed lens is determined. Since it cannot be taken completely, it has a means to issue a warning to that effect.

Further, the above-mentioned conventional device has a lens thickness measuring means for measuring the thickness of the unprocessed lens in correspondence with the radius vector information of the lens frame, in addition to the lens diameter measuring means.

(Problems to be solved by the invention) By the way, although it is ideal in terms of eye refraction correction that the optical axis of the eyeglass-wearing eye and the optical axis of the lens are the same, in reality, the optical axis does not match like this. There is a gap. This misalignment can be divided into a component in the left-right direction (horizontal direction) and a component in the up-down direction (vertical direction), and even a slight amount can be tolerated. Moreover, the permissible range of vertical axis misalignment is wider than the lateral misalignment of both eyes.

Therefore, even if the conventional device warns that the unprocessed lens cannot take the desired lens frame shape, it may be possible to take the lens frame shape by adjusting the eccentricity of the lens and the lens frame to some extent. . For this judgment, it is important to know in which radial angle direction of the lens frame it is impossible to take, but the conventional device could not provide information other than the warning.

Moreover, since the conventional device requires the lens diameter measuring device in addition to the lens thickness measuring device as described above, the device tends to be complicated and expensive.

Therefore, a first object of the present invention is to determine whether or not a lens corresponding to a lens frame shape can be completely taken from an unprocessed lens, and if it is not possible, to obtain the angle information of the radius vector which cannot be taken. An object of the present invention is to provide at least a raw lens determination device for a ball-sliding machine.

A second object of the present invention is to provide an unprocessed lens determination device for a ball slicing machine, which can measure lens thickness and lens diameter with a simple and inexpensive structure.

Another object of the present invention is to automatically change the eccentricity between the lens and the lens frame so that the lens frame shape can be taken from the unprocessed lens when the lens frame shape cannot be taken from the unprocessed lens. An object of the present invention is to provide an unprocessed lens determination device for a ball slicing machine.

(Means for Solving the Problem) Based on this object, a raw lens determination device for a ball-sliding machine according to the present invention is a frame shape measuring means for obtaining radius vector information of a lens frame shape of an eyeglass frame. At least one abutting member to be brought into contact with the refracting surface of the unprocessed lens, and a detecting means for detecting that the abutting member is out of the refracting surface.

Further, it has display means for displaying the area detected by the detection means by superimposing it on the shapes of the lens frame and the unprocessed lens.

Further, when the detection means detects that the contact member is out of the refracting surface, the eccentric amount between the unprocessed lens and the lens frame is adjusted so that the unprocessed lens can have the lens frame shape. It has a changing means for changing.

Further, the abutting member is two feelers that come into contact with the front surface and the rear surface of the lens, and a measuring means for measuring a distance between the two feelers is provided.

(Example) Hereinafter, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a raw lens determination device according to the present invention.

In FIG. 1, reference numeral 1 is a frame shape measuring device for measuring the shape of the lens frame LF of the spectacle frame F. As shown in FIG. 3, the frame shape measuring apparatus 1 determines the shape of the lens frame LF as radial information (ρ _i , θ _i ) [i = 1,2,3, ...
N] directly from the lens frame LF, or
The radius vector information of the shape of the mold formed by copying from the lens frame LF is similarly measured. The detailed structure and operation of the frame shape measuring apparatus 1 are disclosed in Japanese Patent Application Nos. 60-115079 and 60-287491, which are the prior applications of the present applicant.

Lens frame measured by such a frame shape measuring device 1
The radial information of the LF or the template is stored in the memory 2. An arithmetic and control unit 5 is connected to the memory 2 so that information can be transmitted to each other, and an eccentric position input unit 6 is connected to the arithmetic and control unit 5. The eccentric position input device 6 has operation buttons 61 arranged on the operation panel 8 as shown in FIG.
Having ~ 65. Further, the arithmetic and control unit 5 is connected with a display 7 made of, for example, liquid crystal as shown in a display example in FIG.

Usually, the unprocessed lens L is rarely ground so that the geometric center 0g of the lens frame LF coincides with the optical axis Oe of the wearing eye E, and in reality, the optical axis Oe and the geometric center 0g Usually has a deviation (eccentricity) of a in the horizontal direction and b in the vertical direction. The eccentricity amounts a and b are called the inward displacement amount and the upper displacement amount.

The arithmetic and control unit 5 inputs the frame PD (the geometric center distance between the left and right lens frames) of the spectacle frame, the one-side interpupillary distance of the wear eye E, and the wear eye E from the lowermost end of the lens frame, which are input in advance. The amount of inset based on the distance to the optical axis Oe
a, the amount of top-up b is calculated. The optical axis O _{L of the} unprocessed lens L is located at a position having this inner shift amount a and upper shift amount b, that is, eccentricity amounts a and b.
If the lens L is ground as if decentered, the optical axis O _L of the lens _L is aligned with the optical axis Oe of the eye E when the lens L is framed. Therefore, the arithmetic and control unit 5
Radius vector information of the lens frame based on the geometric center O _G of the lens frame (ρ _i, θ _i) 'radius vector information based on i.e. lens machining origin ([rho _i' position O _L of the optical axis after the lens eccentricity, theta _i ')). New radial information (ρ _i ′, θ _i ′) after this coordinate conversion is stored in the memory 2.

Reference numeral 3 is a lens thickness measuring device, and the construction and operation of this lens thickness measuring device 3 are the same as those described in detail in the above-mentioned Japanese Patent Application No. 60-115079. This lens thickness measuring device 3 has a pulse motor 36
Has a stage 31 which is moved back and forth by the drive, and fillers 32 and 34 for sandwiching the lens L are provided on the stage 31. The fillers 32 and 34 are urged by springs 38 and 38 in directions toward each other, and are always in contact with the lens L on the front surface (front refraction surface) and the rear surface (rear refraction surface). Further, the fillers 32, 34 have discs 32a, 34a of radius r which are rotatably supported as shown in FIG. 2A.

On the other hand, the lens rotation shafts 4, 4 of the carriage (not shown) are rotatably driven by the pulse motor 37, and the lens L is sandwiched between the lens rotation shafts 4, 4. As a result, the lens L is rotationally driven by the pulse motor 37.
The optical axis O _L of the lens L are brought to coincide with the axis of the rotary shaft 4, 4.

The pulse motor 37 has radial information (ρ _i ′,
Of the angle θ _i ′), the angle information θ _i ′ is input and the lens L is rotated from the reference position by the angle θ _i ′ according to the angle information.
On the other hand, the radial length ρ _i ′ is input to the pulse motor 36, and the disks 32a and 34a of the fillers 32 and 34 are moved back and forth through the stage 31 to move from the optical axis O _L to the optical axis O _L as shown in FIG. 4B. Radial length ρ _i ′
Position. And filler 3 at this position
The encoders 33, 35 detect the movement amounts a _i , b _i of the 2, 34, and the detection signals from the encoders 33, 35 are input to the arithmetic and control unit 5.

The arithmetic and control unit 5 calculates b _i −a _i = D _i , D _i −2r = Δ _i to calculate the lens thickness Δ _i .

As shown in FIG. 4A, when the displacement amounts a ′ and b ′ become large, the lens L decentered so as to have the optical axis at the new processing point O _L ″.
Then, the lens frame locus (ρ _i ″, θ _i ″) cannot be completely taken, and the shaded portion UC is located outside the lens L. Radial information (ρ _i ″, based on this machining point O _L ″,
When the lens thickness Δ _i ″ is measured by θ _i ″), the discs 32a, 34a of the fillers 32, 34 shown in FIG. 2B are shown in the angular range of radial angles α _{1 to} α ₂ as shown in FIG. 4B. Abut each other,
The lens thickness Δ _i is Δ _i = 0. That is, the arithmetic and control unit 5 detects that the lens thickness Δ _i has become zero, moves the lens L to the desired eccentric positions a ′, b ′, and moves the radius vector (ρ _i ″, θ _i ″). It is determined that the shape of the lens frame having the can not be completely obtained by cutting and the inclined portion UC ′ is insufficient.

The arithmetic and control unit 5 displays the first radial angle α _{1 at} which the lens thickness Δ _i becomes zero, the final radial angle α ₂ or both as an angle as shown in FIG. At this time, the display device 7
The image in FIG. 4B may be displayed on the screen. Also, the lens thickness Δ _i
Since the radius vector ρα when is zero matches the radius R of the lens L, the radius of the lens L can be known from the radius vector length ρα. Therefore, when the measurement is performed over the radius vector ρα when the lens thickness Δ _i becomes zero, the display device 7 displays that the lens diameter is required to be ρα (= R) or more, and this is displayed. Notify the operator. At this time, the display device 7 also displays the eccentricity amounts a ′ and b ′ at the same time. "IN"
Means "inner justification", and "UP" means "upper justification".

Incidentally, instead of determining that the lens diameter is insufficient only when the lens thickness Δ _i becomes zero, it is also possible to consider the expected error amount in advance and determine that the lens diameter is insufficient when Δ _i ≦ 2C. As shown in the figure, since it is expected that the fillers 32, 34 will be caught on the lens edge surface LK of the discs 32a, 34a, the measured lens thickness Δ _{i of the} radius vector (ρ ′ _i-1 , θ _i ′ _i-1 ) _-1 and radial (ρ
_i ″, θ _i ″) variation with lens thickness Δ _i Δ _i −Δ _i-1
= When P is greater than or equal to a specified value (≤P), filler 32,34
May deviate from the lens L, that is, it may be determined that there is a radial length portion longer than the radius R of the lens L, and it may be determined that the lens diameter is insufficient.

The operator moves from the required lens diameter ρα displayed on the display device 7 and the angle information α ₁ or α ₂ or the lens diameter shortage position or range of “α _{1 to} α ₂ ” and the eccentricity amounts a ′ and b ′ to the upper and lower sides. The amount of eccentricity to be adjusted in the direction is determined, and the “UP” button 62 of the eccentric position input device 6 is turned on. Next, the "D" button 64 is operated to decrease the vertical eccentricity amount, that is, the amount of upward displacement b'to change it to b ". That is, the geometric center O _G " of the lens frame is moved up to O _G by a distance V. By moving it to, the entire circumference of the new lens frame radius vector locus (ρ _i , θ _i ) can be located in the lens L, and the lens diameter is not insufficient.

The operator again uses the new eccentricity amounts a ′, b ″ to re-adjust the lens thickness Δ _i [i
= 1,2,3, ... N] and check that Δ _i never becomes zero. The "I" button is used to increase the amount of eccentricity, and when the "IN" button is pressed, the horizontal direction, that is, the inset amount a'is changed.

Instead of changing the eccentricity amount according to the operator's judgment, the arithmetic and control unit 5 may automatically obtain a new eccentricity amount that does not cause a lens diameter shortage.

FIG. 7 shows an example thereof, and the lens diameter shortage range θ
_In the range of _j to θ _{j + k} , ρ _{j + k} sin θ _{j + k} = V _k [k = 1,2,3,
... k] is calculated, the maximum value V of V _k is found, and the center O _{G of the} lens frame is moved to O _G ′ by this V.

Figure 8 is shows another example, the lens径不foot range angle theta _j through? Difference between the radius vector length ρ _j ~ρ _{j + k} and the lens radius R between the _{j + k ρ j + k} - Knowing the radius (ρ _β , θ _β ) at which R = l _k [k = 1,2,3, ... k] is maximum l _max , l _max sin θ _β = V, l _max cos
θ _β = H is calculated, and the eccentricity amount is corrected by H (horizontal alignment) H and V (vertical alignment) V, respectively.

Then, the corrected eccentricity amount based on FIG. 7 or FIG. 8 is displayed on the display device 7, and when the operator judges that the corrected eccentricity amount is OK, the “S” button is turned on, and the arithmetic and control unit is operated. Reference numeral 5 performs coordinate conversion into radius vector information based on this new processing origin, and the lens is ground based on this.

If the lens diameter is input in advance by an input device (not shown), the amount of eccentricity that does not cause the lens diameter shortage can be obtained from the beginning.

(Effects of the Invention) According to the present invention, since the position where the lens diameter is insufficient can be indicated by the angle display, the operator determines how much the lens eccentricity should be corrected to prevent the lens diameter from becoming insufficient. Can be a great help to

Further, it becomes more convenient if the arithmetic and control unit automatically calculates it.

Further, according to the present invention, since the lens thickness measuring device is also used as the lens diameter insufficiency determining device, a dedicated member for determining the lens diameter is not required unlike the conventional device.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a determination device according to the present invention. 2A to 2C are explanatory views showing the principle of measuring the lens thickness by the filler. FIG. 3 is an explanatory diagram regarding the radius vector information of the lens frame and the amount of eccentricity. FIG. 4A is an explanatory diagram showing the relationship between the lens, the lens frame locus, and the amount of eccentricity of the lens. FIG. 4B is a schematic diagram showing the operating principle of the present invention. FIG. 5 is an explanatory diagram showing an example of the input device and the display device. FIG. 6 is an explanatory diagram showing that the lens diameter shortage portion is eliminated by the correction of the eccentricity amount. FIG. 7 is an explanatory diagram showing an example of a calculation principle for calculating the eccentricity correction. FIG. 8 is an explanatory diagram showing another example of the calculation principle for calculating the eccentricity correction. 1 ... Frame shape measuring device 3 ... Lens thickness measuring device 5 ... Computational control device 6 ... Eccentric position input device 7 ... Display device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigeki Kuwano 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Tokyo Optical Machinery Co., Ltd. (72) Shinji Uno 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Tokyo Optics Machine Co., Ltd. (72) Inventor Takahiro Watanabe 75-1 Hasunumacho, Itabashi-ku, Tokyo Tokyo Optical Machine Co., Ltd.

Claims (4)

[Claims] 1. A frame shape measuring means for obtaining radius vector information of a lens frame shape of a spectacle frame, at least one abutting member for abutting a refracting surface of a raw lens, and the abutting member from the refracting surface. An unprocessed lens determination device for a ball shaving machine, comprising: a detection unit that detects that the lens has come off. 2. The ball shaving machine according to claim 1, further comprising display means for displaying an area detected by the detection means in an overlapping manner with the shapes of the lens frame and the unprocessed lens. Raw lens determination device of. 3. The unprocessed lens and the lens frame so that the lens frame shape can be taken from the unprocessed lens when the detection means detects that the contact member is out of the refracting surface. The unprocessed lens determination device for the ball shaving machine according to claim 1, further comprising changing means for changing an eccentricity amount. 4. The abutting member is two feelers that come into contact with the front surface and the rear surface of the lens, and a measuring means for measuring a distance between the two feelers is provided. An unprocessed lens determination device for the ball slide machine according to any one of 1 to 3.