FR2556848A1 - READING MAGNET - Google Patents

Abstract

THIS MAGNIFIER IS OF THE TYPE INCLUDING AT LEAST ONE LENS WITH TWO SENSITIVELY PARALLEL VERTICAL EDGES, A CONVEX DIOPTER 6 TURNS ON THE USER'S SIDE CONSTITUTED FOR EXAMPLE BY A TRUNCON WITH A SPHERICAL, ASPHERIC OR ELLIPTICAL SURFACE, AND A BOTTOM OF 5 TURNS. DOCUMENT TO BE READ AND CONSTITUTED BY A FLAT OR SPHERICAL OR ASPHERICAL SIDE. ACCORDING TO THE INVENTION, THE LIMIT POINTS I OF THE DIOPTER VISIBLE BY THE USER AT A NORMAL READING DISTANCE, THAT IS TO SAY THE POINTS SITUATED ON A RADIUS 8 SENSITIVELY TANGER TO DIOPTER 6 AND CORRESPONDING TO A SENSITIVELY RASANT IMPACT, ARE CONNECTED TO THE BOTTOM 5 BY FLAT SURFACES 7 EACH FORMING WITH THE NORMAL 9 AT THE INCIDENT RADIUS SHAVING AN ANGLE A LESS THAN OR EQUAL TO THE LIMIT ANGLE.

Description

I

READING MAGNET

  The present invention relates to a reading magnifier, and more specifically a magnifying glass intended to be placed on the sheet with characters to read. This magnifying glass is especially intended for reading bound sheets on which are printed small characters.

  teres, as is the case for telephone directories.

  In order to reduce the number of pages of telephone directories9, these are printed over a large width, making it difficult, with a traditional magnifying glass, to read the names and telephone numbers located on the binding side. Indeed, when a magnifying glass with a flat bottom, whose face located on the side of the eyes of the user is a diopter of hemispherical or elliptical shape, and this magnifying glass is placed on a sheet of a book with an edge in support against the binding zone9 it is not possible for the user to read the printed characters on the sheet and located at a distance from the considered edge of the magnifying glass. As a result, the movement of the magnifying glass being limited, on the binding side, it is not possible to read the characters situated in the vicinity of the latter, which is particularly troublesome in the case of a directory in the measure o the beginning of the names or the end of the numbers

which are read is truncated.

  This results from the fact that, in the areas near the edges of the magnifying glass, the rays, after passing through the magnifying glass, meet the diopter at an angle greater than the limit angle and are therefore reflected by it. The limit angle is defined as the angle that forms with the normal to the diopter at a point considered, an incident ray

  arriving at this point, whose emerging ray is grazing.

  This limit angle is a function of the material of the magnifying glass, its

  the value being approximately 41.5 for crown and 420.15 for polymetallic

methacrylate copolymer.

  The present invention aims to remedy these disadvantages.

  For this purpose, in the magnifying glass it concerns the type comprising

  at least one lens having two substantially parallel vertical edges

  the, a convex diopter turned on the side of the user constituted for example by a spherical, aspheric or elliptical surface section, and a bottom turned on the side of the document to be read and constituted by a flat face, the diopter endpoints visible by the user at a distance

  normal reading, that is, points on a sensitive ray-

  tangent to the diopter and corresponding to a substantially grazing incidence are connected to the bottom by flat surfaces each forming with the normal to the incident ray grazing an angle c0 less than or equal to

at the limit angle.

  This arrangement is very interesting because all the characters to be read, located opposite the bottom of the magnifying glass are visible through

  the convex diopter, and are read after magnification by the user.

  Thus, in the case of a book or a directory, it is possible to bring an edge of the bottom of the magnifying glass in contact with the binding, which allows

  to read the characters located near the latter.

  It is interesting to use a magnifier with an elliptical diopter because this shape provides an increase in the field for a given peak power or the possibility of increasing

  the distance from the diopter to the reading plane and consequently the magnification.

  According to an interesting feature of the invention, this magnifying glass is equipped with four feet which, projecting from the bottom, are arranged at the four corners thereof, each leg being of triangular section and having a side in the extension of a face. inclined connecting

the diopter at the bottom of the magnifying glass.

  The shape of these feet is interesting because they do not interfere

  the positioning of the magnifying glass in relation to the document to be read, and in particular

  compared to the binding of this one. In addition, the feet avoid any contact between the magnifying glass and the document, which results in an absence of scratches from the bottom of the magnifying glass and prevents it from being in the tilting position, insofar as the sheet to be read is bent,

  which is the case in the area close to the binding.

  According to another feature of this magnifying glass, interesting in the case of reading a telephone directory, the

  magnifying glass is wider at one end than at its other end.

  This arrangement makes it possible to have a wide reading zone which makes it possible

  both looking for the name of a contact in a directory, while the narrow zone allows the reading of the phone number of it after identifying the name. This difference in width can be translated

  frustoconical shape of the magnifying glass or two zones with

  both each of the parallel edges at different distances in the

two areas.

  It is advantageously provided a longitudinal reference mark

  with a magnifying glass at the bottom of it, in order to facilitate the rapprochement-

  between the name and the telephone number sought.

  Anyway, the invention will be well understood using the

  description which follows with reference to the attached schematic drawing

  as a nonlimiting example, an embodiment of this magnifying glass: Figure I is a perspective view in the reading position; Figure 2 is a side view in reading position; Figure 3 is a view from above; Figure 4 is an end view; Figure 5 is a very schematic side view representing

the path of a light ray.

  The magnifying glass (2), shown in the drawing, has two vertical edges

  substantially parallel blocks in the form of two sections, namely a section (3) and a section (4), the section (3) being wider than the section (4). This magnifying glass is further delimited by a flat bottom (5) intended to be turned on the side of the sheet to be read, and by an elliptical diopter (6). As represented in particular in FIG. 5, the flat bottom (5) is connected to the diopter (6) by faces (7) inclined downwards.

  at the top and from the inside to the outside.

  If we consider that, to perform a reading, the eye of the user

  sator is located at point (0), the point (I) being on the line of intersection of an inclined face (7) and the diopter (6), and substantially corresponding to a grazing ray (8), the face (7) is oriented so

  forming with the normal (9) at the radius (8) an angle (x) of an inferior value

  than the limit angle of approximately 420.15, provided that the

  magnifying glass is made of polymethacrylate.

  This will allow the user to read through the dioptre between the point (I) and its symmetrical point relative to the axis of the diopter all the characters lying opposite the bottom (5), even close to the edges of the it is located on the side of the inclined edges. This results from the fact that, in this zone, none of the rays will be reflected by the diopter

and that they will cross it all.

  As shown in the drawing, this magnifying glass is equipped with four feet (10) located at the four corners of the bottom (5), each of which has

  a side (12) located in the extension of the corresponding face (7).

  Finally, and as shown in Figure 3, a tracking line

  (13) facilitating reading is placed on the flat bottom (5).

  From a practical point of view, if the magnifying glass is used for reading

  re of a directory (14), its wide area (3) is located on the side of the binding (15), so that the feet (10), located on the side of the wide zone of the magnifying glass, are supported in the V formed by the leaves in the binding. As a result, one of the edges of the bottom (5) is brought in the immediate vicinity of the edge of the sheet to be consulted for reading characters located near this edge. The wide area of the magnifying glass for reading characters arranged on several lines serves

  locating the name of the interlocutor whose number is to be found.

  After locating the name, the user positions the line (13) under it, -

  and then he just has to follow the line to read the phone number

  of his interlocutor in the narrow area of the magnifying glass.

  As is apparent from the foregoing, the invention provides a great improvement to the existing technique by providing a magnifying glass for reading at the level of its entire bottom, having a high power and, consequently, a large magnification, ensuring

  a perfect comfort to the user.

  It goes without saying that the invention is not limited to the sole embodiment of this magnifying glass, described above as an example;

  it embraces, on the contrary, all variants.

  It is thus notably that this magnifying glass could comprise two lenses superimposed or that the vertical faces of each lens could be not parallel but convergent, without

  it is so far from the scope of the invention.

Claims (5)

claims   1 Reading magnifier, of the type comprising at least one lens   having two substantially parallel vertical edges, a diopter   vexe (6) rotated on the user side, constituted for example by a spherical, aspherical or elliptical surface section, and a bottom (5) turned towards the document to be read and constituted by a planar or spherical face or asphérique, characterized in that the endpoints (1) of the diopter visible to the user at a normal reading distance, that is to say the points located on a radius (g) substantially tangential to the 19 diopter (6). ) and corresponding to a substantially grazing incidence, are connected to the bottom (5) by planar surfaces (7) each forming with the normal (9) the incident ray grading an angle (t <) less than or equal to limit angle.   2. - Loupe according to claim 1, characterized in that it is equipped with four feet (10) which, projecting from the bottom (5), are arranged at the four corners thereof, each foot being of triangular section and having a side (12) in the extension of a face   inclined (7) connecting the diopter to the bottom of the magnifying glass.   3. - Magnifier according to any one of claims 1 and 29   characterized in that it is wider at one of its ends than at its other end.   4. - magnifier according to claim 3, characterized in that   its lateral faces are parallel and consist of two successive zones   in which the faces are at different distances.   5. Magnifying lens according to any one of claims 1 to 4,   characterized in that its bottom comprises a longitudinal reference mark (13).