KR100468418B1 - Protect cover having clairvoyance window - Google Patents

Abstract

The present invention relates to a baby carriage protective cover for use when the baby is put out in a baby carriage. Stroller protective cover according to the present invention in order to prevent the fatigue of the occupant's eyes and the resulting vision degradation caused by the conventional stroller protective cover is a protective cover of the stroller protective cover made of at least one material of vinyl, waterproof fabric, PVC It is characterized in that it is provided with a see-through window having a light transmittance of 85 to 95% and an absolute refractive index of 1.45 to 1.55 on the front of the front of the body and the infant's eyes focused. According to this, it prevents direct contact with harmful external environment and at the same time guides the infant's eyes from the parts other than the viewing window where light transmittance is low, so that the objects can be seen clearly without distortion, reducing eyestrain and reducing vision. It can greatly protect the infant's eyesight, such as preventing. Moreover, the baby carriage protective cover according to the present invention has the advantage of being lightweight and easy to carry and store.

Description

Protective cover having clairvoyance window

The present invention relates to a baby carriage protective cover that is installed in the baby carriage when the baby is put out in the baby carriage, and more particularly, to a baby carriage protective cover that can protect the eyesight of the infant.

Stroller protection cover is a structure installed in the stroller to protect the infant from the external environment such as dust, automobile smoke, other airborne pollutants, and cold outside temperature. Made of transparent material for viewing. The stroller protective cover is made of PVC, PE, or polyurethane sheet, and its thickness is about 0.3 to 0.5 mm. Stroller protective cover is implemented by sewing a plurality of sheets made of such a material and thickness to cover the stroller.

However, the vinyl sheet of 0.2-0.5 mm thick PVC, PE, and polyurethanes, which are commonly used as a conventional baby carriage protective cover, has a significantly lower light transmittance than glass (85%). In addition, PVC, PE, polyurethane, etc., which are manufactured by a blower method, have a uniformity in film thickness and density due to the limitation of the manufacturing method produced by rolling on a roll. Likewise, the phenomenon of refracting light through a non-uniform medium occurs. Snell's law of refraction (nD = sin i / sin r = v1 / v2 = λ1 / λ2; nD: absolute refractive index, I: incident angle, r: refractive angle, v1: Speed of light in medium 1, v2: speed of light in medium 2, λ 1: wavelength of light in medium 1, λ 2: wavelength of light in medium 2) Partial refractive index is changed by causing a difference in speed and wavelength of light. This difference in refractive index makes the object look distorted when the infant looks at an object through the protective cover and the image focuses on one point. As a result, the low light transmittance and the refracting phenomena of light not only make the external objects clearly visible but also prevent the image of the object from becoming a focal point in the retina of the infant, causing the shape of the object to be severely distorted.

In addition, the existing stroller protective cover has a characteristic of being wrinkled well, causing the phenomenon that the convex lens and the concave lens are crossed, resulting in a short or long focal length like aberration, or a straight line curve. Is generated. That is, the focal position of the light beam is different for each portion of the protective cover of the baby carriage, so that the image of the object is not formed on the plane but is formed on the curved surface, causing a phenomenon in which a straight line is curved, such as a failure type distortion and a barrel shape distortion. Figure 2a is a view showing a normal image, Figures 2b and 2c is a view showing the distortion caused by aberration phenomenon, Figure 2b shows a failure type distortion, Figure 2c shows a barrel-shaped distortion.

As described above, the conventional baby stroller protective cover has a refractive index that is changed for each part due to light transmittance, density and thickness nonuniformity, and properties of the material that are well wrinkled, resulting in distortion of the image. As a result, the fatigue of the sight and the deterioration of vision due to the distortion of the object occurs. Even those who are aware of these hazards have no alternatives, so they are using existing stroller protection covers.

The present invention is to provide a baby stroller protective cover that can prevent the decline of vision of the infant by keeping the pure function to protect the infant in the stroller from the outside environment and at the same time to see the object without distortion and refraction. .

1 is a diagram illustrating the refracting phenomenon of light passing through a non-uniform medium,

Figure 2a is a view showing a normal image, Figures 2b and 2c is a view showing a distortion phenomenon due to aberration phenomenon,

3 is a perspective view showing a baby carriage installed with a baby carriage protective cover according to the present invention;

4 is an enlarged front view of part “A” of FIG. 3;

5 and 6 are views for calculating the viewing window horizontal length and vertical length of the baby carriage protective cover according to the present invention,

7 shows the path of light through a uniform medium.

Explanation of symbols on the main parts of the drawings

10; Baby carriage cover 20; Protective cover body

21; Front vinyl part 22; Side vinyl part

23; Upper vinyl part 30; Viewing window

40; Sewing part 45; Adhesive Nonwoven

50; Vents 55; Vent cover

60; Ultrasonic compression unit 100; stroller

Stroller protective cover according to the present invention for achieving the above object is a baby carriage protective cover which is installed in the baby carriage, the baby stroller protective cover is a baby riding with a protective cover body made of at least one material of vinyl, waterproof fabric, PVC It is characterized by comprising a see-through window having a light transmittance of 85 to 95% and an absolute refractive index of 1.45 to 1.55 at the top of the front surface where the gaze of the eye is concentrated.

In the baby carriage protective cover according to the present invention, the protective cover body may be made of a material such as PVC, PE, or polyurethane, and the light transmission rate is similar to or superior to that of the plate glass (85%), and the unit weight is 1 / of the plate glass. It may be composed of poly-methyl methacrylate (PMMA) resin or polycarbonate which is 2 to 1/4 level. The PMMA resin has a refractive index of 1.49, a light transmittance of 92 to 93%, and a polycarbonate having an absolute refractive index of nD of 1.48 and a light transmittance of 90 to 93%, which is lighter than plate glass and has a high light transmittance and a low refractive index. Thus, the occupant can visually receive the object without distortion through the viewing window.

On the other hand, the sight glass is bonded to the protective cover body of 0.3 ~ 0.5㎜ thick PVC, PE or polyurethane, which is commonly used as a protective cover for strollers, so that it is not easily separated from temperature changes and impacts. The sight glass may be joined to the protective cover body by means of a bar.

Hereinafter, a baby carriage protective cover according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view showing a baby carriage with a baby carriage protective cover according to the present invention, FIG. 4 is an enlarged front view of the portion “A” of FIG. 3, and FIGS. 5 and 6 are horizontal views of a baby carriage protective cover according to the present invention. Figures for calculating the length and the longitudinal length, Figure 7 is a view showing the path of light through the uniform medium.

3 and 4, the protective cover for the baby carriage 10 according to the present invention for protecting the infant from contaminated air, dust, rain, wind, pollen, etc. to prevent the object from being distorted, the protective cover is It is divided into a body 20 and a see-through window 30. The protective cover body 20 is the front vinyl portion 21, the side vinyl portion 22 and the upper vinyl portion 23 is bar-coupled to each other by a predetermined length by the sewing portion 40 so as to cover the baby carriage 100 have. The side vinyl part 22 and the top vinyl part 23 extend longer than the side and top surface of the baby carriage 100, and the adhesive nonwoven fabric 45 is formed in the predetermined position of the extended bar part part, respectively. . Another adhesive nonwoven fabric formed by mutually bonding the adhesive nonwoven fabric of the extended portion of both side vinyl portions 22 and the adhesive nonwoven fabric of the extended portion of the upper vinyl portion 23 formed in the extended portion of the both side vinyl portions 22 ( (Not shown) to be installed in the stroller. On the other hand, the upper side of each of the vinyl portion 22 is formed with a plurality of holes vent 50 is formed, the vent cover 55 covering the vent 50 is fixed to one of the rod portion 40. An adhesive nonwoven fabric (not shown) is also coupled to the inner side of the vent cover 55, and an adhesive nonwoven fabric (not shown) is also coupled to the corresponding position.

Here, each of the vinyl parts 21, 22, and 23 constituting the protective cover body 20 is 0.2 to 0.5 mm thick used for a general baby carriage protective cover, and is made of vinyl material such as PVC, PE, or polyurethane having excellent softness. to be. In addition to vinyl, it may be composed of a waterproof fabric sheet or the like.

The see-through window 30 is formed at the center of the upper layer of the front vinyl part 21 where the gaze of the infant as the occupant is most concentrated. The sight glass 30 utilizes a fixation, which is a kind of reflex action occurring after 5-6 months of life, that is, a phenomenon in which the baby naturally moves his eyes toward a clear view of an object. Degree (approximately 60˚ from center), binocular distance (approx. 5 cm), distance from binocular to stroller protective cover (approx. 20 cm), distance from binocular to biaxial and axle center (approx. 4 cm), eyeball thickness (approx. 2.5cm) is secured beyond the minimum size necessary to secure the infant's field of view.

Here, the size necessary to secure the most common infant's vision will be obtained. Referring to FIG. 5, a binocular vision of a general infant is about 60 ° from a center, and an average binocular distance AB of an infant is 5 cm, and a distance from M, which is a distance from both eyes, to a stroller protective cover, is about 20 cm. In the triangular OAM, the AOM is 30 ° and the tan 30 ° value of 0.578 is equal to 2.5cm / OM, so the vertical distance from the center of the binocular vision to both eyes is about 4.3cm. Therefore, as in the symmetry of the symmetrical triangle OM: ON = AB: CD, 4.3: 24.3 = 5: CD, it can be seen that the CD of the horizontal length of the viewing window 30 is about 28 cm. In addition, since the average infant's eyeball thickness is 2.5 cm, as shown in FIG. 6, if the distance 4.3 cm from both eyes to the center of the binocular vision O 'is substituted into the symmetrical triangle, O'M': EF = O'N ': GH, that is, It can be seen that the GH corresponding to the length of the viewing window 30 at 4.3: 2.5 = 24.3: GH is about 15 cm. As a result, the size of the viewing window 30 required for securing the baby's field of view should be about 28 cm or more and about 15 cm or more.

In addition, the see-through window 30 has a refractive index similar to that of the plate glass (absolute refractive index 1.5) while the light transmittance is superior to the plate glass (85%) and the unit weight is about 1/2 to 1/4 of the plate glass. It consists of a material such as PMMA resin (absolute refractive index 1.49, light transmittance 92-93%), specific gravity 1.2) or polycarbonate (absolute refractive index 1.48, light transmittance 90-93%, specific gravity 1.2). However, the present invention is not limited thereto, and the light transmittance of 90% or more is superior to that of the plate glass, and the refractive index may be adopted if the material has a property of having an absolute refractive index of 1.45 to 1.55 similar to the plate glass and a specific gravity of 1.2 or less.

Here, the see-through window 30 is bonded by an ultrasonic compression joint method to form an ultrasonic crimping part 60 so that it is not easily separated from a temperature change and an impact. However, the present invention is not limited thereto, and may be bonded by rod bonding, and may be combined to be detachable and attachable using an adhesive nonwoven fabric.

As in the above-described embodiment, the stroller protective cover of the present invention is provided with a PMMA or polycarbonate viewing window having a light transmittance of 90% or more is provided on the front upper layer of the stroller protective cover in which the eyes of the infant are concentrated, and the view provided by the plate glass. A clearer field of view can be secured and the constant of refractive index can be maintained as shown in FIG. 7 according to the planarity and density and thickness uniformity according to high intensity. Therefore, when the object is viewed through the viewing window, the image of the object is clearly seen without distortion. In particular, when the object is viewed through the sight window, the parallel movement of the image, which is a general phenomenon according to Snell's law, is minimized to the extent that it cannot be visually felt, so that the infant sees the object without the stroller's protective cover and through the stroller's protective cover. There is little difference in the phase of the infant's retina. When viewed through the viewing window from the inside of the protective cover to the outside of the stroller is excellent in transparency and refractive index can give the same feeling as watching the front through the car window in the passenger car. Moreover, PMMA or polycarbonate, which is a material of the sight glass, has a constant strength that can be always kept flat so that it can always be flat.

In addition, the baby carriage protective cover of the present invention is made of a light weight as the thickness of the viewing window is 0.5mm or less does not significantly affect the weight increase of the entire baby carriage protective cover. In addition, the viewing window is configured to a minimum size that can provide the vision required for the infant can be easily folded in all directions toward the viewing window along the viewing window boundary when storing and carrying, there is no inconvenience in use.

According to the stroller protective cover according to the present invention as described above, by blocking the direct contact with the harmful external environment and at the same time induces the eye of the infant from the portion other than the viewing window in which the light transmittance is lowered to see the object clearly without distortion. This can dramatically reduce the eyesight of the infant, such as reducing eye fatigue and preventing vision loss. Moreover, there is an advantage of being lightweight and easy to carry and store.

Claims (7)

In the stroller protective cover installed in the stroller, the stroller protective cover is 85 to 95% of the front of the front of the baby's eyes focused on the protective cover body made of at least one material of vinyl, waterproof fabric, PVC A baby carriage protective cover, characterized in that it has a light transmission window and a rigid viewing window that can maintain flatness with an absolute refractive index of 1.45 to 1.55. delete The protective cover of claim 1, wherein the viewing window is made of any one of PMMA resin and polycarbonate. The baby carriage protective cover according to claim 1, wherein the viewing window has a thickness of 0.3 to 0.5 mm. The protective cover of claim 1, wherein the viewing window is attached to the protective cover body by an ultrasonic compression joint method. The baby carriage protective cover according to claim 1, wherein the viewing window is bar-bonded to the protective cover body. The protective cover of claim 1, wherein the viewing window is detachably attached to the protective cover body.